Cell Biology and Human Classification Quiz
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Questions and Answers

What is the primary function of the nucleus in a cell?

  • Control center for cellular activities (correct)
  • Energy production
  • Synthesis of carbohydrates
  • Storage of nutrients
  • What are the major components of cytoplasm?

  • Proteins and fats
  • Water, organic and inorganic compounds (correct)
  • Nucleolus and organelles
  • Ribosomes and DNA
  • What structure within the nucleus is responsible for the synthesis of proteins and RNA?

  • Rough Endoplasmic Reticulum
  • Nucleolus (correct)
  • Chromosomes
  • Cell membrane
  • How is Rough Endoplasmic Reticulum different from Smooth Endoplasmic Reticulum?

    <p>It is involved in protein manufacture (D)</p> Signup and view all the answers

    Which of the following structures is found in all eukaryotic cells?

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

    What function do chromosomes serve within the nucleus?

    <p>Carry genes for hereditary traits (A)</p> Signup and view all the answers

    What distinguishes Smooth Endoplasmic Reticulum from its Rough counterpart?

    <p>Involvement in lipid production (D)</p> Signup and view all the answers

    What is the composition of the endoplasmic reticulum?

    <p>Membranous canals filled with fluid (C)</p> Signup and view all the answers

    What family do humans belong to?

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

    Which genus is known for having a maximally developed brain?

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

    Which characteristic is not associated with the Hominidae family?

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

    What distinguishes the species Homo sapiens from others?

    <p>Highly developed speech center (B)</p> Signup and view all the answers

    Which of the following ranks is most specifically associated with the classification of humans?

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

    What is the correct taxonomic rank above genus for humans?

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

    Which of the following pairs correctly identifies the taxonomic rank of a lion?

    <p>Species: Panthera leo (A), Family: Felidae (C)</p> Signup and view all the answers

    What is the classification for the housefly?

    <p>Genus: Musca (D)</p> Signup and view all the answers

    What is the primary function of respiration in living cells?

    <p>To release energy from food (A)</p> Signup and view all the answers

    How do living organisms obtain nutrition?

    <p>By digesting and assimilating food (A)</p> Signup and view all the answers

    What does irritability refer to in living organisms?

    <p>The ability to sense and respond to stimuli (A)</p> Signup and view all the answers

    What describes the process of growth in living organisms?

    <p>Production of new cells using food (A)</p> Signup and view all the answers

    What is excretion primarily concerned with?

    <p>Eliminating harmful waste products (D)</p> Signup and view all the answers

    What type of reproduction involves the fusion of gametes?

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

    What does competition among organisms typically occur for?

    <p>Resources such as food and space (A)</p> Signup and view all the answers

    Which statement about movement in response to stimuli is correct?

    <p>Movement can be positive or negative based on the stimulus (B)</p> Signup and view all the answers

    What is the main function of amyloplasts?

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

    What percentage of ribosomes is composed of RNA?

    <p>67% (A)</p> Signup and view all the answers

    What is the main function of the Golgi Apparatus?

    <p>Transporting, modifying, and packaging proteins (D)</p> Signup and view all the answers

    Which organelle is described as minute and vesicular, containing various enzymes and proteins?

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

    What is the primary function of the cytoskeleton?

    <p>Providing shape and mechanical resistance (D)</p> Signup and view all the answers

    Cilia work by functioning like which of the following?

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

    Which type of ribosome is found in prokaryotes?

    <p>70S (C)</p> Signup and view all the answers

    What is the structure of the Golgi Apparatus primarily composed of?

    <p>Flat stacked pouches called cisternae (C)</p> Signup and view all the answers

    What is the primary function of compartmentalization in eukaryotic cells?

    <p>To separate incompatible chemical reactions (C)</p> Signup and view all the answers

    How does compartmentalization improve the efficiency of chemical reactions in eukaryotic cells?

    <p>By allowing substrates to be maintained at high concentrations (A)</p> Signup and view all the answers

    What distinguishes eukaryotic chromosomes from prokaryotic chromosomes?

    <p>Eukaryotic chromosomes are housed in a nucleus (C)</p> Signup and view all the answers

    What is one advantage of clustering enzymes in organelles?

    <p>It speeds up reaction time between substrates (B)</p> Signup and view all the answers

    Which of the following cells is generally larger?

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

    Shared characteristics between eukaryotic and prokaryotic cells may include all except:

    <p>Both contain membrane-bound organelles (B)</p> Signup and view all the answers

    What role does cytosol play in eukaryotic cells?

    <p>It supports the organelles and facilitates exchange (B)</p> Signup and view all the answers

    In eukaryotic cells, the organelles function similarly to which of the following?

    <p>Specialized industrial buildings (C)</p> Signup and view all the answers

    What structures are DNA molecules packaged into within the nucleus of a cell?

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

    Which process is responsible for ensuring genetic information is faithfully copied during cell division?

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

    What is the total number of chromosomes in a typical human cell?

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

    What occurs during crossing over in meiosis?

    <p>Chromosomes break and exchange segments (C)</p> Signup and view all the answers

    What determines the sex of offspring in humans?

    <p>Presence of X and Y chromosomes (A)</p> Signup and view all the answers

    What term describes pairs of chromosomes containing alleles of the same genes?

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

    Which process contributes to genetic diversity through the random distribution of chromosomes to gametes?

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

    Who first described chromosomes in 1875?

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

    Flashcards

    Respiration

    The process of breaking down food within cells to release energy for life processes.

    Nutrition

    The process by which organisms take in food to obtain energy and nutrients.

    Irritability

    The ability to detect and respond to changes in the environment, both internal and external.

    Growth

    The process of permanent increase in the size and number of cells within an organism.

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    Excretion

    The removal of waste products, toxic substances, and excess materials from an organism's body.

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    Reproduction

    The process by which organisms produce offspring to continue their species.

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    Competition

    When organisms compete for resources such as food, water, space, and light.

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    Survival of the fittest

    Survival of the fittest - those best adapted to compete for resources survive and reproduce.

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    Hominidae

    The family Hominidae includes species that are able to walk upright on two legs.

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    Bipedal Locomotion

    Bipedal locomotion is the ability to walk upright on two legs, a key characteristic of Hominidae.

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    Genus Homo

    Genus Homo encompasses species with highly developed brains and hands suitable for tool making.

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    Species Homo sapiens

    The species Homo sapiens is characterized by a well-developed speech center in the brain.

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    Taxonomic Classification

    Taxonomic classification helps organize and understand the relationships between different organisms.

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    Taxonomic Ranks

    The taxonomic ranks are hierarchical levels used to organize life forms, from broad categories like kingdom to specific species.

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    Seven Main Taxonomic Ranks

    The seven main taxonomic ranks are: Kingdom, Phylum, Class, Order, Family, Genus, and Species, though additional sub-ranks exist.

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    Taxonomic Rank Naming Conventions

    When writing the names of taxonomic ranks, use lowercase initial letters, except for the first word of the rank name.

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    Cytosol

    The fluid portion of a eukaryotic cell, located between the plasma membrane and the organelles.

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    Compartmentalization in eukaryotic cells

    The process of dividing a cell into functional compartments, each with specific tasks.

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    Surface area-to-volume ratio in cells

    The ratio of a cell's surface area (outer membrane) to its volume. A larger volume requires more efficient nutrient uptake and waste removal.

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    Separation of incompatible reactions

    A key advantage of compartmentalization, allowing incompatible chemical reactions to occur simultaneously without interfering with each other.

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    Increased efficiency of chemical reactions

    Another advantage provided by compartmentalization. Enzymes and substrates can be clustered together, speeding up reactions and increasing efficiency.

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    Nucleus

    A structure found in eukaryotic cells that contains the cell's genetic material, DNA.

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    Organelles

    The membrane-bound compartments within the cytoplasm of eukaryotic cells. They perform various functions.

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    Compartmentalization in eukaryotic cells vs. prokaryotic cells

    The main difference between eukaryotic and prokaryotic cells. It refers to the presence of internal membrane-bound compartments in eukaryotes.

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    Cytoplasm

    A gel-like substance found within the cell membrane and surrounding the nucleus. It contains water, organic and inorganic compounds, and serves as the location for most cellular activities.

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    Nuclear membrane

    A double-layered membrane surrounding the nucleus that allows certain substances to pass through.

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    Chromosomes

    Thin thread-like structures found within the nucleus that carry genes, the units responsible for passing traits from one generation to the next.

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    Genes

    A hereditary unit found on chromosomes, responsible for passing traits from parents to offspring.

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    Endoplasmic Reticulum (ER)

    A network of membranous canals filled with fluid, acting as the cell's transportation system.

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    Rough Endoplasmic Reticulum (RER)

    A type of ER with ribosomes attached, responsible for protein synthesis.

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    Amyloplasts, Aleuroplasts, Elaioplasts

    Specialized organelles that store carbohydrates like starch (in potatoes), proteins, or oils and fats.

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    Ribosomes

    Tiny, non-membrane bound organelles vital for protein synthesis, found in both prokaryotes and eukaryotes.

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    Golgi Apparatus

    A membrane-bound organelle that processes, packages, and transports proteins and lipids to their final destinations within the cell.

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    Microbodies

    Small, membrane-bound organelles that contain enzymes responsible for various metabolic processes, found in both plant and animal cells.

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    Cytoskeleton

    A complex network of protein filaments that provides structural support, helps with movement, and plays a role in cell division.

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    Cilia

    Hair-like projections that extend from the cell surface and can move the cell or surrounding fluids.

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    Flagella

    Long, whip-like projections that help cells move through fluids.

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    Cytokinesis

    The process of cell division, resulting in two daughter cells.

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    What are chromosomes?

    DNA is organized into thread-like structures called chromosomes, found within the nucleus of each cell.

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    What are histones?

    Chromosomes are made up of DNA tightly coiled around proteins called histones.

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    What is the role of mitosis in cell division?

    During cell division, mitosis ensures that each daughter cell receives an identical copy of the parent cell's chromosomes.

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    What is the role of meiosis in sexual reproduction?

    Meiosis is a special type of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes.

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    What is the significance of chromosome number in a species?

    Each species has a specific number of chromosomes, which is crucial for maintaining the integrity of its genetic code.

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    What are homologous chromosomes?

    Homologous chromosomes are paired chromosomes, one from each parent, carrying the same genes but potentially different versions (alleles) of those genes.

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    How does crossing-over contribute to genetic variation?

    Crossing-over during meiosis allows homologous chromosomes to exchange genetic material, creating new combinations of alleles in offspring.

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    How does independent assortment contribute to genetic variation?

    The random distribution of chromosomes to gametes during meiosis further increases genetic diversity.

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    Study Notes

    BIO 101 Study Notes

    • Heredity and Evolution: Heredity is the passing of genetic information from one generation to the next, carried by genes—segments of DNA. Different types of heritable traits exist, including physical (eye color, height), physiological (blood type, metabolism), behavioral (instincts, learning tendencies), and disease susceptibility (inherited disorders).

    Characteristics and Classification of Living Things

    • Seven characteristics of living organisms: These distinguish living things from non-living things:
      • Nutrition/Feeding: Organisms obtain energy and materials from their surroundings.
      • Respiration: Release of energy from food within cells.
      • Sensitivity: Organisms respond to internal or external stimuli.
      • Reproduction: Organisms produce offspring of their own kind.
      • Growth: A permanent increase in an organism's size or body mass.
      • Excretion: Removal of waste products from the organism's body.
      • Movement: Organisms' ability to change location.

    Characteristics of Living Organisms

    • Classification: Organisms are grouped according to structural similarities; from the largest group (kingdoms) to the smallest (species): Kingdom, Phylum, Class, Order, Family, Genus, and Species.

    Anaerobic Respiration

    • Animals: Some organisms and tissues can respire without oxygen using anaerobic respiration. This process is less efficient than aerobic respiration, but can be crucial for short-term activities or when oxygen is limited. For example, muscle activity.

    Classification of Animals

    • Artificial Classification: Groups organisms for convenience based on visible features like habitat, movement, or diet.
    • Natural Classification: Organisms are grouped based on evolutionary and genetic relationships, taking into consideration many characters to determine natural affinities

    Reproduction in Animals

    • Sex: Male and female gametes combine their genetic material to reproduce.
    • Asexual Reproduction: Offspring are genetically identical to the parent.
    • Sexual Reproduction: Creates unique offspring by combining genetic material from two parents

    Reproduction in Plants

    • Asexual Reproduction: New plants form without the use of seeds. Methods include vegetative propagation, cutting, grafting.
    • Sexual Reproduction: Seeds are the main mode, resulting from the fusion of male and female gametes. This often involves pollination (transfer of pollen to stigma) leading to fertilization and fruit/seed formation.

    Other topics

    • Taxonomy: The science of naming and classifying organisms into groups based on structural and evolutionary relationships. Two major types of classification are known - artificial and natural.

    • Artificial classifications: Use simplified criteria for grouping organisms, not reflecting phylogenetic relationships

    • Natural classifications: Group organisms based on evolutionary relationships, using a hierarchical structure: Kingdom, Phylum, Class, Order, Family, Genus, Species.

    • Artificial and natural classifications: These are two major approaches to classification. Artificial classification uses few characters to aid in classification. The natural classification uses many more features which helps to reflect the phylogenetic and evolutionary relationships effectively.

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    Description

    Test your knowledge on cell biology and the classification of humans in this comprehensive quiz. From the functions of the nucleus and cytoplasm components to the taxonomy of Hominidae, challenge your understanding of key biological concepts. Prepare to explore cellular structures and human evolution.

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