Biodiversity and Prokaryotes
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Questions and Answers

What is the primary function of xylem in plants?

  • Carrying out photosynthesis
  • Storing carbohydrates and water
  • Moving water from the roots to the leaves (correct)
  • Transporting sugars from the leaves to other parts of the plant
  • Which of the following is NOT a characteristic of meristematic tissue?

  • Can divide by mitosis
  • Found in areas of growth, like stem tips and root tips
  • Made up of unspecialized cells
  • Responsible for transporting water from the roots to the leaves (correct)
  • During photosynthesis, what happens to the oxygen produced?

  • It is released into the atmosphere (correct)
  • It is stored in the plant's roots
  • It is combined with water to create sugars
  • It is used for cellular respiration by the plant
  • What is the connection between transpiration and cohesion?

    <p>Cohesion helps water molecules stick together, which is essential for the transpirational pull that drags water up from the roots. (B)</p> Signup and view all the answers

    How does the plant unit connect to the animal systems unit?

    <p>Plants provide oxygen for animals to breathe, and animals produce carbon dioxide that plants use for photosynthesis. (C)</p> Signup and view all the answers

    Which of the following is a key connection between the plant unit and evolution?

    <p>Plants have evolved to develop complex vascular tissue for transporting water and nutrients. (B)</p> Signup and view all the answers

    What is the role of phloem in plant transport?

    <p>Phloem transports sugars from the leaves to other parts of the plant for energy. (D)</p> Signup and view all the answers

    What is the function of the stomata in plant leaves?

    <p>To regulate gas exchange and water loss (A)</p> Signup and view all the answers

    A human somatic cell contains how many chromosomes in its nucleus?

    <p>46 (D)</p> Signup and view all the answers

    Which of the following processes is responsible for creating gametes?

    <p>Meiosis (B)</p> Signup and view all the answers

    Which of the following bacteria classifications describes the arrangement of bacteria in clumps?

    <p>Staphylo (C)</p> Signup and view all the answers

    What is the term for the observable traits or characteristics of an organism?

    <p>Phenotype (C)</p> Signup and view all the answers

    What is the defining characteristic of an obligate aerobe?

    <p>They require oxygen for survival. (C)</p> Signup and view all the answers

    An individual with two identical alleles for a specific gene is considered:

    <p>Homozygous (A)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of autosomal dominant inheritance?

    <p>The trait can skip generations. (A)</p> Signup and view all the answers

    Which of the following is NOT a method of bacterial movement?

    <p>Passive movement (C)</p> Signup and view all the answers

    What is the process called where homologous chromosomes exchange genetic material during meiosis?

    <p>Crossing-over (B)</p> Signup and view all the answers

    Which of the following accurately describes a characteristic of Gram-negative bacteria?

    <p>They have two membrane layers in their cell wall. (C)</p> Signup and view all the answers

    Which phase of mitosis is characterized by the alignment of chromosomes at the center of the cell?

    <p>Metaphase (B)</p> Signup and view all the answers

    Which of the following fungal classifications describes a relationship where both organisms benefit from the interaction?

    <p>Mutualistic (A)</p> Signup and view all the answers

    What is the primary function of the small intestine?

    <p>Absorption of nutrients. (A)</p> Signup and view all the answers

    Which of the following is NOT a mechanism of evolution?

    <p>Cellular Respiration (A)</p> Signup and view all the answers

    Which of the following is considered the functional unit of the respiratory system?

    <p>Alveoli (D)</p> Signup and view all the answers

    What is the most likely effect of the bottleneck effect on a population?

    <p>Decreased genetic diversity (D)</p> Signup and view all the answers

    What is the function of the left ventricle?

    <p>Pumps oxygenated blood to the body. (C)</p> Signup and view all the answers

    Which of the following is a characteristic of a beneficial mutation?

    <p>It increases an organism's fitness. (A)</p> Signup and view all the answers

    Which of the following is NOT a positive interaction between different kingdoms?

    <p>Predation (D)</p> Signup and view all the answers

    Which of the following statements is TRUE about maternal inheritance?

    <p>Traits are inherited from the mother. (B)</p> Signup and view all the answers

    What is the significance of the law of segregation in genetics?

    <p>It explains why offspring can inherit different traits from their parents. (A)</p> Signup and view all the answers

    Which of the following describes the process of sexual reproduction in fungi?

    <p>Fungi can reproduce both sexually and asexually. (A)</p> Signup and view all the answers

    Which of the following is a characteristic of a cladogram?

    <p>It represents a hypothetical relationship between groups of organisms. (C)</p> Signup and view all the answers

    Which of the following is NOT a mechanism that contributes to increasing genetic variation?

    <p>Mitosis (B)</p> Signup and view all the answers

    Which of the following is NOT a type of bacterial classification?

    <p>Phylogeny Classification (B)</p> Signup and view all the answers

    What is the term for a cross between two individuals who differ in only one trait?

    <p>Monohybrid cross (C)</p> Signup and view all the answers

    Which of the following is a key component of the theory of evolution?

    <p>Random changes in allele frequencies drive evolution. (D)</p> Signup and view all the answers

    How does genetics contribute to understanding biodiversity?

    <p>It explains how natural selection acts on genetic variations within populations. (C)</p> Signup and view all the answers

    Which of the following is an example of a positive interaction between different kingdoms?

    <p>A bacteria providing nitrogen to a plant. (B)</p> Signup and view all the answers

    During which phase of meiosis is the chromosome number reduced from diploid to haploid?

    <p>Meiosis I (A)</p> Signup and view all the answers

    What is the name of the process where the cytoplasm of a cell divides?

    <p>Cytokinesis (C)</p> Signup and view all the answers

    Which of the following is an example of a beneficial mutation?

    <p>A mutation that makes a bacterium resistant to antibiotics. (C)</p> Signup and view all the answers

    Which of the following is an example of a species that is classified as a coccus?

    <p>Staphylococcus aureus (A), Streptococcus pyogenes (C)</p> Signup and view all the answers

    Which of the following is NOT a classification used to classify bacteria?

    <p>Habitat (D)</p> Signup and view all the answers

    What are the three domains of life?

    <p>Archaea, Bacteria, Eukarya (A)</p> Signup and view all the answers

    Which kingdom is characterized by autotrophic organisms with cell walls made of cellulose?

    <p>Plantae (B)</p> Signup and view all the answers

    What is the primary difference in the cell structure between prokaryotes and eukaryotes?

    <p>Eukaryotes have a nucleus, while prokaryotes do not. (B)</p> Signup and view all the answers

    Which of the following statements about biodiversity is true?

    <p>Biodiversity refers to the variety of life in a specific area. (D)</p> Signup and view all the answers

    Which of the following is NOT a fundamental characteristic used to classify organisms into kingdoms?

    <p>Habitat (D)</p> Signup and view all the answers

    What does binomial nomenclature signify?

    <p>A two-part Latin name for species identification. (D)</p> Signup and view all the answers

    Which of the following organisms would belong to the Fungi kingdom?

    <p>Yeasts (C)</p> Signup and view all the answers

    Which of the following best describes the term 'taxon'?

    <p>A category used to classify organisms. (B)</p> Signup and view all the answers

    What is the definition of homology in the context of evolutionary biology?

    <p>Similar structures from a common ancestor. (B)</p> Signup and view all the answers

    What is an example of vestigial features?

    <p>The pelvis in snakes. (B)</p> Signup and view all the answers

    What distinguishes convergent evolution from divergent evolution?

    <p>Convergent evolution results from similar environmental influences. (D)</p> Signup and view all the answers

    Which process describes the formation of a new species due to geographical isolation?

    <p>Allopatric speciation. (D)</p> Signup and view all the answers

    Which barrier is characterized by two species that mate at different times?

    <p>Temporal isolation. (C)</p> Signup and view all the answers

    What is the primary role of antibiotic resistance in bacteria?

    <p>It enables bacteria to survive when exposed to antibiotics. (B)</p> Signup and view all the answers

    What evolutionary concept explains why the wings of birds and bats are similar despite differing ancestors?

    <p>Analogy. (A)</p> Signup and view all the answers

    Which is an example of a prezygotic reproductive barrier?

    <p>Gametic isolation. (B)</p> Signup and view all the answers

    What allows for significant variations in traits within a species, particularly in plants?

    <p>Genetic variation. (B)</p> Signup and view all the answers

    Which mechanism of evolution directly involves human influence on breeding?

    <p>Artificial selection. (D)</p> Signup and view all the answers

    Which type of isolation occurs when two species occupy different habitats?

    <p>Habitat isolation. (B)</p> Signup and view all the answers

    What supports the concept of common ancestry at the molecular level?

    <p>DNA and protein similarities. (B)</p> Signup and view all the answers

    What is hybrid infertility?

    <p>When hybrid offspring are sterile despite being healthy. (D)</p> Signup and view all the answers

    Which of the following statements is incorrect regarding homologous structures?

    <p>They arise due to similar environmental challenges. (A)</p> Signup and view all the answers

    What is the primary function of stomata in plants?

    <p>Release water vapor and facilitate gas exchange (B)</p> Signup and view all the answers

    Which tissue type is responsible for transporting water and nutrients in plants?

    <p>Vascular tissue (C)</p> Signup and view all the answers

    What distinguishes angiosperms from gymnosperms?

    <p>Angiosperms produce flowers and fruits, while gymnosperms produce naked seeds on cones (B)</p> Signup and view all the answers

    Which part of the plant is primarily responsible for photosynthesis?

    <p>Leaves (B)</p> Signup and view all the answers

    What is the primary function of root hairs in plants?

    <p>Absorb water and nutrients from the soil (B)</p> Signup and view all the answers

    What characteristic do non-vascular plants lack compared to vascular plants?

    <p>Ability to grow tall and transport water over long distances (B)</p> Signup and view all the answers

    Which structure on leaves aids in regulating water loss?

    <p>Stomata (D)</p> Signup and view all the answers

    Which type of root system is characterized by a large, thick main root with smaller lateral roots?

    <p>Taproot system (A)</p> Signup and view all the answers

    What type of plant is considered a seedless vascular plant?

    <p>Fern (C)</p> Signup and view all the answers

    Which structure offers protection to the root as it grows through the soil?

    <p>Root cap (A)</p> Signup and view all the answers

    In which part of a flowering plant would you find ovules?

    <p>Ovary (B)</p> Signup and view all the answers

    What role does the chlorophyll play in plants?

    <p>Absorbing sunlight for photosynthesis (A)</p> Signup and view all the answers

    What is the function of the phloem in plants?

    <p>Distribute glucose throughout the plant (C)</p> Signup and view all the answers

    Which type of plant is characterized by producing seeds that develop within fruits?

    <p>Angiosperm (A)</p> Signup and view all the answers

    What is the primary function of the left ventricle in the circulatory system?

    <p>Pumps oxygenated blood to the body (D)</p> Signup and view all the answers

    Which statement about the control of breathing is correct?

    <p>Increased CO₂ levels lower blood pH. (A)</p> Signup and view all the answers

    How does the body regulate blood pressure when it drops too low?

    <p>Heart rate increases and blood vessels constrict (C)</p> Signup and view all the answers

    What is the role of chloroplasts in photosynthesis?

    <p>Convert light energy into chemical energy (D)</p> Signup and view all the answers

    What is the significance of the aorta in the circulatory system?

    <p>Transports oxygenated blood to the body (A)</p> Signup and view all the answers

    What happens during the systemic circuit of the circulatory system?

    <p>Oxygen is delivered to body cells in exchange for CO₂ (C)</p> Signup and view all the answers

    What initiates the process of thermoregulation when the body overheats?

    <p>Sweating to release heat (A)</p> Signup and view all the answers

    Which of the following is true about veins in the circulatory system?

    <p>They rely on valves to ensure one-way blood flow (C)</p> Signup and view all the answers

    How do roots contribute to a plant's water absorption?

    <p>By absorbing water and minerals from the soil (D)</p> Signup and view all the answers

    In what way does the respiratory system help maintain blood pH?

    <p>By expelling CO₂ to reduce carbonic acid levels (B)</p> Signup and view all the answers

    What can occur if blood glucose levels drop too low?

    <p>Glucagon signals the liver to release stored glucose (A)</p> Signup and view all the answers

    Which structure plays a crucial role in preventing over-expansion of the lungs?

    <p>Stretch receptors (D)</p> Signup and view all the answers

    How does the body respond when it is dehydrated?

    <p>The kidneys conserve water and trigger thirst (C)</p> Signup and view all the answers

    What is the initial step in the process of photosynthesis?

    <p>Absorption of sunlight by chlorophyll (D)</p> Signup and view all the answers

    What characteristic of capillaries is vital for gas exchange in the body?

    <p>Very small and thin walls (B)</p> Signup and view all the answers

    Flashcards

    Taxonomy

    The science of classifying organisms into groups based on shared characteristics.

    Taxon

    A category used in classifying living things. There are 8 levels, from general to specific: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

    Domain

    The highest and most general level of classification. There are 3 domains: Archaea, Bacteria, and Eukarya.

    Kingdom

    A group of organisms that share fundamental characteristics like cell structure and reproduction.

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    Binomial Nomenclature

    A two-part Latin name used to identify a specific species. The first part is the genus name (capitalized) and the second is the species name (lowercase).

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    Eukarya

    Organisms with cells that have a nucleus. This domain includes animals, plants, fungi, and protists.

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    Bacteria

    Organisms that lack a nucleus in their cells. They are single-celled and are found in a wide variety of environments.

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    Archaea

    Primitive single-celled organisms without a nucleus. They often live in extreme environments.

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    Gram Stain

    A stain used to categorize bacteria based on their cell wall structure, differentiating between gram-positive and gram-negative bacteria.

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    Gram-positive bacteria

    Bacteria with a single membrane layer and a thick protein layer that retains the Gram stain, appearing purple under the microscope.

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    Gram-negative bacteria

    Bacteria with two membrane layers and a thin protein layer that does not retain the Gram stain well, appearing pink under the microscope.

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    Flagella

    Long whip-like structures used by bacteria to move.

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    Corkscrew Motion

    A type of movement used by spirochetes, involving a corkscrew-like motion.

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    Coccus

    Spherical-shaped bacteria.

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    Bacillus

    Rod-shaped bacteria.

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    Spirochetes

    Spiral-shaped bacteria.

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    Heterotrophic bacteria

    Organisms that obtain nutrients from carbon-containing chemicals in their environment, 'eating' to survive.

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    Autotrophic bacteria

    Organisms that can produce their own food, like plants.

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    Obligate Aerobes

    Organisms that require oxygen to survive.

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    Facultative aerobes

    Organisms that can use oxygen when it's available, but can also switch to fermentation to extract energy when oxygen is absent.

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    Obligate anaerobes

    Organisms that cannot survive in the presence of oxygen.

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    Parasitic fungi

    Fungi that absorb nutrients from living cells of a host organism.

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    Mutualistic fungi

    Fungi that have beneficial relationships with other organisms, where both benefit.

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    Cladogram

    A diagram depicting a hypothetical evolutionary relationship between groups of organisms, like a family tree.

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    What is a phenotype?

    The observable traits or characteristics of an organism, such as eye color, height, or hair texture.

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    What is a genotype?

    The genetic makeup of an organism, represented by letters like AA, Aa, or aa.

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    What is homozygous?

    Two of the same alleles for a gene. Example: PP or pp.

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    What is heterozygous?

    Two different alleles for a gene. Example: Pp.

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    What is a pedigree?

    A family tree that shows the inheritance of traits across generations. It uses symbols to represent individuals and their relationships.

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    What is a mode of inheritance?

    The way a gene is inherited, like being dominant or recessive, and carried on an autosome or sex chromosome.

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    What is autosomal dominant inheritance?

    An allele is dominant, carried on an autosome, and only one copy is needed to express the trait.

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    What is autosomal recessive inheritance?

    An allele is recessive, carried on an autosome, and two copies are needed to express the trait.

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    What is X-linked dominant inheritance?

    An allele is dominant, carried on the X chromosome, and affects both males and females.

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    What is X-linked recessive inheritance?

    An allele is recessive, carried on the X chromosome, and affects males more often than females.

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    What is Y-linked inheritance?

    The allele is carried on the Y chromosome, and only males inherit it from their father.

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    What is maternal inheritance?

    The allele is found in the mitochondrial DNA, which is inherited from the mother.

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    What is mitosis?

    The process of cell division where a single cell splits into two identical daughter cells. Used for growth and repair.

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    What is meiosis?

    The process of cell division where a single cell splits into four daughter cells, each with half the number of chromosomes. Used for sexual reproduction.

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    What is crossing over?

    During meiosis I, homologous chromosome pairs exchange genetic material, increasing genetic variation.

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    Vascular tissue

    A type of plant tissue responsible for transporting water and nutrients throughout the plant.

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    Transpiration

    The process of water movement through a plant, from roots to leaves, and evaporating through the stomata.

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    Transpirational pull

    The force that pulls water upward in the xylem due to water evaporation from the leaves.

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    Cohesion

    The attraction between water molecules that helps them stick together, aiding in water transport.

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    Adhesion

    The attraction between water molecules and the xylem walls, helping water move upwards against gravity.

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    Translocation

    The process of transporting sugars produced by photosynthesis through the phloem to other parts of the plant.

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    Meristematic tissue

    Unspecialized plant cells that can divide by mitosis, responsible for plant growth.

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    Stomata

    Small openings on the underside of leaves that allow for gas exchange during photosynthesis.

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    Homology

    Structures in different species that have a similar underlying anatomy, but may have different functions. They indicate shared ancestry.

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    Analogy

    Structures in different species that have similar functions, but evolved independently. They show that similar environments can lead to similar adaptations.

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    Divergent Evolution

    The process of evolution where closely related species develop different traits due to different environmental pressures. This results in the diversification of a common ancestor into different forms.

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    Convergent Evolution

    The process of evolution where unrelated species develop similar traits due to shared environmental pressures. This indicates that similar solutions can evolve independently.

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    Vestigial Features

    Reduced or non-functional structures in an organism that were present and functional in its ancestors. These structures provide evidence of evolutionary history.

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    Biogeography

    The study of the distribution of species across the Earth. This helps to understand how organisms have evolved and spread over time.

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    Speciation

    The process by which one species splits into two or more species.

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    Prezygotic Reproductive Barriers

    Reproductive barriers that prevent mating or fertilization between two species. This keeps species distinct.

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    Postzygotic Reproductive Barriers

    Reproductive barriers that occur after mating and fertilization. This can result in hybrid offspring that are not viable or fertile.

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    Allopatric Speciation

    Speciation that occurs when populations are geographically separated, preventing gene flow. This allows for genetic divergence and the development of reproductive barriers.

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    Sympatric Speciation

    Speciation that occurs within the same geographic region, often due to genetic changes that prevent interbreeding. This can be driven by factors like polyploidy (changes in chromosome number) or disruptive selection.

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    Ploidy

    The number of sets of chromosomes in a somatic cell.

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    Haploid Number

    The number of chromosomes in one set of an organism. It represents the haploid number.

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    Artificial Selection

    The process of selectively breeding organisms for desired traits. This can lead to significant changes in a population over time.

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    Antibiotic Resistance

    The development of resistance to antibiotics in bacteria due to natural selection. This happens when antibiotics are overused or misused, leading to the survival and reproduction of resistant bacteria.

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    Fossils

    The remains of ancient organisms preserved in rock or other materials. Fossils provide direct evidence of past life and its evolution.

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    Aorta

    The main artery carrying oxygenated blood from the left ventricle to the entire body.

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    Left Ventricle

    This chamber pumps oxygenated blood from the heart to the rest of the body.

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    Pulmonary vein

    This vein carries oxygenated blood from the lungs back to the heart.

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    Pulmonary artery

    This vessel carries deoxygenated blood from the right ventricle to the lungs for oxygenation.

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    Superior Vena Cava

    This vein carries deoxygenated blood from the upper body to the right atrium.

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    Homeostasis

    The body's process of maintaining a stable internal environment despite external changes.

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    Thermoregulation

    The maintenance of a stable internal body temperature.

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    Blood Glucose Regulation

    Maintaining a stable blood glucose level for energy.

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    Osmoregulation

    Maintaining the right balance of water and salts in the body.

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    Blood pH Regulation

    The process of maintaining a stable blood pH for proper cellular function.

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    Blood Pressure Regulation

    Maintaining stable blood pressure to ensure proper blood flow to all tissues.

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    Pulmonary Circuit

    The pathway of blood flow from the heart to the lungs and back to the heart.

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    Systemic Circuit

    The pathway of blood flow from the heart to the rest of the body and back to the heart.

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    Arteries

    Thick-walled vessels carrying high-pressure blood away from the heart.

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    Veins

    Thin-walled vessels carrying low-pressure blood towards the heart.

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    Xylem

    The vascular tissue that transports water and dissolved minerals upward from the roots to the rest of the plant.

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    Phloem

    The vascular tissue that transports sugars produced during photosynthesis from the leaves to other parts of the plant.

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    Photosynthesis

    The process by which plants use sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen.

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    Chlorophyll

    A pigment found in chloroplasts that absorbs sunlight energy for photosynthesis.

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    Taproot System

    A type of root system with a large main root that grows downward, with smaller lateral roots branching off.

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    Fibrous Root System

    A type of root system with many small roots that are often shallow and branched, forming a dense network.

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    Root Hairs

    Specialized cells in roots that primarily absorb water from the soil.

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    Vascular Cylinder

    The central part of the root that contains the vascular tissues (xylem and phloem).

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    Root Cap

    A protective layer of cells at the tip of the root that helps it move through the soil.

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    Meristem

    A region of actively dividing cells in roots that contribute to root growth.

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    Leaf Blade

    The main part of a leaf responsible for light absorption.

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    Petiole

    The stalk that connects the leaf blade to the stem.

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    Stomata (plural)

    Tiny pores on the surface of leaves that regulate the exchange of gases and water vapor.

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    Study Notes

    Biodiversity

    • Biodiversity encompasses the variety of life forms (animals, plants, fungi, microorganisms) in a specific area.
    • Key threats to biodiversity include: climate change, pollution, habitat loss, overexploitation, and invasive species.
    • Taxonomy is the science of classifying organisms.
    • The classification system uses 8 levels (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species).
    • More shared levels mean closer related species.
    • Domains are Archaea (primitive single-celled organisms without a nucleus), Bacteria (single-celled organisms without a nucleus), and Eukarya (organisms with cells having a nucleus).
    • Kingdoms (Animalia, Plantae, Fungi, Protista) are categorized by cell type, structure, nutrition, reproduction, and examples.
    • Binomial nomenclature is the two-part naming system used by scientists (e.g., Rosa canina for briar rose).

    Prokaryotes

    • Prokaryotes (Bacteria and Archaea) lack a nucleus.
    • Cell walls differ in composition (peptidoglycan in bacteria, varied in archaea).
    • Gram stain distinguishes bacteria based on cell wall structure (Gram-positive stain purple, Gram-negative pink).
    • Motion can be passive, by flagella (whip-like structures), archaella (in archaea), corkscrew motion (spirochetes), or gliding on mucus.
    • Shapes include coccus (spherical), bacillus (rod-shaped), and spirochete (spiral-shaped).
    • Grouping classifications include diplo (pairs), staphylo (clumps), and strepto (strings).
    • Nutritional modes include autotrophic (making own food) and heterotrophic (obtaining nutrients).
    • Oxygen needs include obligate aerobes (require oxygen), facultative aerobes (can use oxygen or fermentation), and obligate anaerobes (cannot survive in oxygen).

    Fungi

    • Fungi can be parasitic, predatory, mutualistic, or saprobial (absorbing nutrients from dead matter).
    • Reproduction is both sexual (spores survive harsh conditions) and asexual.
    • Some fungi reproduce through asexual methods like binary fission.

    Interactions Between Kingdoms

    • Positive interactions include mutualism (bees pollinating plants), symbiosis (fungi aiding plant nutrient absorption), and nitrogen fixation (bacteria providing nitrogen to plants).
    • Negative interactions include parasitism (parasites harming hosts), competition (species vying for resources), and predation (animals consuming others).

    Phylogeny and Cladograms

    • Phylogeny groups species by evolutionary relationships.
    • Cladograms visually represent evolutionary relationships.

    Evolution

    • Evolution is the idea that species are descendants of earlier, different species.
    • Key mechanisms of evolution include natural selection, genetic drift (bottleneck and founder effects), mutation, and gene flow.
    • Sexual selection favors traits attractive to mates, even if not beneficial for survival.
    • Evidence of evolution comes from comparative anatomy (homology, divergent and convergent evolution, vestigial features), comparative development (embryonic homology), molecular biology (DNA/protein similarities), artificial selection, antibiotic resistance, fossils, and geographic distribution.
    • Homologous features originate from a common ancestor (same structure, different functions); analogous features arise independently (different structures, same function).
    • Speciation is the formation of new species, with prezygotic (habitat isolation, temporal isolation, behavioral isolation, mechanical isolation, gametic isolation) and postzygotic (zygote mortality, hybrid inviability, hybrid infertility, hybrid breakdown) reproductive barriers.
    • Speciation can occur allopatrically (geographic isolation) or sympatrically (within the same geographic area).

    Genetics

    • Ploidy refers to the number of chromosome sets.
    • Somatic cells are diploid (2n); gametes are haploid (n).
    • Phenotype is the observable trait; genotype is the genetic makeup (represented by alleles).
    • Modes of inheritance include autosomal dominant, recessive, X-linked, Y-linked, and maternal (mitochondrial).
    • Mitosis and meiosis are cell division processes with different outcomes.
    • Mitosis creates 2 identical diploid daughter cells; meiosis creates 4 different haploid daughter cells.
    • The law of segregation states that alleles separate into different gametes; the law of independent assortment states that homologous chromosomes align randomly.
    • Genetic variation increases through random fertilization and crossing over.

    Anatomy

    • The digestive system includes the mouth, esophagus, stomach, small intestine, liver, gallbladder, pancreas, large intestine, rectum, and anus.
    • The respiratory system includes the nose, nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli, and lungs.
    • The circulatory system includes the heart (atria and ventricles), aorta, pulmonary artery, pulmonary veins, vena cava, blood vessels (arteries, veins, capillaries).
    • Homeostasis describes the body’s maintenance of a stable internal environment.
    • Examples include thermoregulation (temperature), blood glucose regulation, osmoregulation (water balance), blood pH regulation, and blood pressure regulation.
    • The circulatory system has two circuits: the pulmonary circuit (heart to lungs to heart) and the systemic circuit (heart to body to heart).

    Plants

    • Plants use photosynthesis to produce glucose and oxygen.
    • Photosynthesis takes place in chloroplasts.
    • Photosynthesis needs sunlight, carbon dioxide, and water.
    • Plant structures (leaves, roots, stems, flowers) work together for transport, support, and reproduction.
    • Major groups of plants include green algae, non-vascular plants, seedless vascular plants, gymnosperms (naked seeds), and angiosperms (flowering plants with enclosed seeds).
    • Plant organs include roots (for absorption and anchoring), leaves (for photosynthesis), stems (for support and transport), and flowers (for angiosperm reproduction).
    • Plant tissues include dermal (protection), ground (photosynthesis and support), vascular (transport), and meristematic (growth).
    • Transpiration is water loss through stomata; translocation is sugar transport through phloem.

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    Explore the essential concepts of biodiversity, including the threats it faces and the classification of life forms. Understand the differences between prokaryotes and eukaryotes, and learn about the taxonomy levels that define the diversity of organisms. This quiz will enhance your knowledge of ecological and biological classification.

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