Atomic Structure and Hypotheses Quiz
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Questions and Answers

What is a characteristic of K-selected species?

  • They have shorter lifespans.
  • They thrive in unstable environments.
  • They provide extensive parental care. (correct)
  • They have many offspring.
  • Which of the following factors is considered density-independent?

  • Competition for resources
  • Natural disasters (correct)
  • Predation
  • Disease
  • What primarily distinguishes population ecology from ecosystem ecology?

  • Population ecology examines population size changes. (correct)
  • Ecosystem ecology studies species interactions.
  • Ecosystem ecology emphasizes individual organism behavior.
  • Population ecology focuses on energy flow.
  • Which of the following correctly defines abiotic factors?

    <p>Nonliving components like sunlight and soil nutrients. (A)</p> Signup and view all the answers

    What is the fundamental niche of a species?

    <p>The full range of environmental resources a species could potentially use. (B)</p> Signup and view all the answers

    Density-dependent factors primarily impact population growth through which mechanism?

    <p>Resource competition. (C)</p> Signup and view all the answers

    Which type of ecology examines energy and material exchanges across multiple ecosystems?

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

    R-selected species are best characterized by which of the following traits?

    <p>Maximizing their intrinsic rate of increase. (C)</p> Signup and view all the answers

    What is the realized niche of a species?

    <p>The specific area a species occupies limited by interactions (D)</p> Signup and view all the answers

    Which of the following best describes mutualism?

    <p>Both species derive benefits from each other (C)</p> Signup and view all the answers

    What type of mimicry involves a harmless species mimicking a harmful one?

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

    Which interspecific interaction is characterized by both species being harmed?

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

    In which type of dispersion are individuals spaced unpredictably?

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

    What is the primary characteristic of semelparity in reproductive strategies?

    <p>Having one large reproductive event followed by death (B)</p> Signup and view all the answers

    What does aposematic coloration indicate?

    <p>Poisonous or venomous nature to predators (A)</p> Signup and view all the answers

    Which of the following defines herbivory in interspecific interactions?

    <p>Eating parts of a plant or alga by an herbivore (D)</p> Signup and view all the answers

    What defines the process of transcription in molecular biology?

    <p>The copying of DNA into RNA (D)</p> Signup and view all the answers

    Which site in the ribosome holds the tRNA carrying the growing polypeptide chain?

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

    How does a codon relate to an anticodon?

    <p>A codon specifies an amino acid, while an anticodon is complementary to it in tRNA. (D)</p> Signup and view all the answers

    What occurs during the lytic cycle of a virus?

    <p>Assembly of new viral particles followed by cell lysis (D)</p> Signup and view all the answers

    What distinguishes the lysogenic cycle from the lytic cycle?

    <p>Viral genome integration into host chromosome (D)</p> Signup and view all the answers

    What is meant by Darwinian fitness?

    <p>The contribution to the next generation's gene pool relative to others (A)</p> Signup and view all the answers

    In what way do viruses differ in their replication cycles?

    <p>The lytic cycle involves immediate production of new viruses, whereas the lysogenic cycle does not. (C)</p> Signup and view all the answers

    What key concept does ecosystem ecology emphasize?

    <p>Energy flow and chemical cycling in organisms and their environment (C)</p> Signup and view all the answers

    What characterizes keystone species in an ecosystem?

    <p>They have a disproportionately large impact on community structure. (C)</p> Signup and view all the answers

    Which of the following best describes primary succession?

    <p>Establishment of life in previously barren environments. (B)</p> Signup and view all the answers

    What is the approximate efficiency of energy transfer from one trophic level to the next?

    <p>10% (B)</p> Signup and view all the answers

    Which type of enzyme inhibition involves an inhibitor binding to the active site?

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

    What is the main function of chlorophyll a in photosynthesis?

    <p>Participating in light reactions. (B)</p> Signup and view all the answers

    What percentage of the human genome constitutes exons?

    <p>1.5% (D)</p> Signup and view all the answers

    How do competitive and noncompetitive inhibition differ?

    <p>Competitive inhibitors bind to the active site, while noncompetitive bind elsewhere. (B)</p> Signup and view all the answers

    Which wavelengths of light are most effective for driving photosynthesis?

    <p>Violet-blue and red light (B)</p> Signup and view all the answers

    Which light wavelength do chlorophyll a pigments absorb most effectively?

    <p>Red light (B), Violet-blue light (D)</p> Signup and view all the answers

    What role do carotenoids play in photosynthesis?

    <p>They solely trap excessive light to protect chlorophyll (A), They reflect violet and blue-green light (C)</p> Signup and view all the answers

    What distinguishes C4 plants from CAM plants?

    <p>C4 plants minimize photorespiration using spatial separation (D)</p> Signup and view all the answers

    How does the lac operon regulate enzyme production for lactose metabolism?

    <p>Lactose binds to the repressor, allowing transcription (B)</p> Signup and view all the answers

    What happens to the number of chromatids after DNA replication?

    <p>Chromatid number doubles while chromosome number stays the same (B)</p> Signup and view all the answers

    Which component is NOT part of the structural organization of the lac operon?

    <p>Lactose-binding site (D)</p> Signup and view all the answers

    What primarily generates the proton gradient during photosynthesis?

    <p>Light-dependent reactions (D)</p> Signup and view all the answers

    Which process most significantly reduces the efficiency of photosynthesis in certain plants?

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

    What is the overall process of cellular respiration characterized by?

    <p>It is a spontaneous catabolic process with a negative delta G. (D)</p> Signup and view all the answers

    During glycolysis, which product is generated?

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

    What occurs during the citric acid cycle?

    <p>Pyruvate is completely oxidized to carbon dioxide. (A)</p> Signup and view all the answers

    In which part of the chloroplast do the light-dependent reactions occur?

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

    What is the role of electron transport chain (ETC) in cellular respiration?

    <p>To pump protons across the membrane and generate a proton gradient. (D)</p> Signup and view all the answers

    Which statement correctly describes fermentation in yeast?

    <p>It regenerates NAD+, allowing glycolysis to continue. (A)</p> Signup and view all the answers

    Which pigments are primarily involved in photosynthesis?

    <p>Chlorophyll a, chlorophyll b, and carotenoids (D)</p> Signup and view all the answers

    Which region of the electromagnetic spectrum do green plants absorb most efficiently?

    <p>Blue-violet and red regions (D)</p> Signup and view all the answers

    Flashcards

    Replication

    The process of copying DNA.

    Transcription

    The process of synthesizing RNA from a DNA template.

    Translation

    The process of synthesizing a polypeptide from an mRNA template.

    Codon

    A sequence of three nucleotides in mRNA that specifies an amino acid.

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    Anticodon

    A sequence of three nucleotides in tRNA that is complementary to a codon.

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    Lytic Cycle

    Viral replication resulting in host cell destruction.

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    Lysogenic Cycle

    Viral replication where the viral genome integrates into host DNA.

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    Darwinian Fitness

    An organism's reproductive success relative to others.

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    Cellular Respiration

    A catabolic process breaking down complex molecules into simpler ones, releasing energy.

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    Photosynthesis

    An anabolic process using light energy to convert CO2 and water into glucose and oxygen.

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    Glycolysis

    First stage of cellular respiration; converts glucose to pyruvate, producing ATP and NADH.

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    Citric Acid Cycle

    Second stage of cellular respiration; completely oxidizes pyruvate to CO2, generating energy carriers.

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    Electron Transport Chain (ETC)

    A series of proteins using energy from electron carriers (NADH, FADH2) to pump protons, powering ATP synthesis.

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    Yeast Fermentation

    A process occurring without oxygen where pyruvate is converted to ethanol or lactate, regenerating NAD+.

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    Light-Dependent Reactions

    Photosynthesis stage capturing light energy to produce ATP and NADPH.

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    Light-Independent Reactions (Calvin Cycle)

    Photosynthesis stage using ATP and NADPH to fix CO2 into sugars.

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    K-selected species

    Species that thrive in stable environments, have few offspring, offer parental care, and live longer.

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    r-selected species

    Species that thrive in unstable environments, have many offspring, provide little parental care, and have shorter lifespans.

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    Density-dependent factor

    A factor that affects population growth, influenced by population size.

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    Density-independent factor

    A factor that affects population growth, regardless of population size.

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    Population Ecology

    Study of factors influencing population size and changes over time.

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    Community Ecology

    Study of interactions between different species within a community.

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    Abiotic Factor

    Non-living component of an ecosystem (e.g., weather, temperature).

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    Biotic Factor

    Living component of an ecosystem (e.g., plants, animals).

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    Realized Niche

    The actual portion of the fundamental niche a species occupies due to competition and interactions with other species.

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    Rainshadow

    A dry area on the leeward side of a mountain range caused by moist air rising, cooling, and releasing precipitation on the windward side.

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    Interspecific Competition

    When individuals of different species compete for a resource that limits their survival and reproduction.

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    Predation

    An interaction where one organism (predator) kills and eats another organism (prey).

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    Herbivory

    An interaction where an herbivore eats parts of a plant or alga.

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    Parasitism

    An interaction where one organism (parasite) derives nourishment from another organism (host) while harming it.

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    Mutualism

    A mutually beneficial interaction between two different species.

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    Commensalism

    An interaction where one species benefits, while the other is neither harmed nor helped.

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    Demographic Transition

    A process where a country shifts from high birth and death rates to low rates as it develops.

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    Energy Transfer Efficiency

    The amount of energy that successfully moves from one trophic level to the next, typically around 10%.

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    Dominant Species

    The species with the highest abundance in a community, based on either population size or biomass.

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    Keystone Species

    A species that has a significantly larger impact on the ecosystem's structure than its abundance might suggest.

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    Primary Succession

    The process where life colonizes an entirely barren land, like a new volcanic island.

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    Secondary Succession

    The recovery of a disturbed ecosystem, like a forest after a fire.

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    Competitive Inhibition

    When an inhibitor molecule blocks the active site of an enzyme, preventing the substrate from binding.

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    Noncompetitive Inhibition

    When an inhibitor molecule binds to a different site on an enzyme, causing its shape to change and reduce activity.

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    Action Spectrum

    The range of wavelengths of light that are most effective in driving photosynthesis. Violet-blue and red light are most effective.

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    Photorespiration

    A process that reduces the efficiency of photosynthesis, particularly in hot, dry environments. It occurs when plants use oxygen instead of carbon dioxide in the Calvin cycle.

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    C4 Plants

    Plants that have evolved a mechanism to minimize photorespiration. They use a spatial separation of carbon fixation and the Calvin cycle.

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    CAM Plants

    Plants that have evolved a mechanism to conserve water in arid environments. They use a temporal separation of carbon fixation (at night) and the Calvin cycle (during the day).

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    Chemiosmosis

    The process by which a proton gradient across a membrane is used to drive ATP synthesis. This happens in both cellular respiration and photosynthesis.

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    Lac Operon

    A group of genes in bacteria that code for enzymes involved in the metabolism of lactose. It includes a promoter, operator, and genes for lactose-metabolizing enzymes.

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    Chromosomes after Replication

    After replication, the number of chromosomes remains the same, but the number of chromatids doubles. Each chromosome now consists of two identical sister chromatids.

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    What regulates the Lac Operon?

    The lac operon is regulated by lactose. It is an inducible operon, meaning it is usually turned off but can be turned on in the presence of lactose. Lactose acts as an inducer, binding to the repressor protein and preventing it from binding to the operator, allowing transcription to proceed.

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    Study Notes

    Scientific Hypotheses

    • A scientific hypothesis is an explanation for an observation, phenomenon, or problem.
    • It must be testable and falsifiable (capable of being proven false).
    • Example: The hypothesis "all swans are white" is falsifiable (provable false) because observing a black swan would disprove it.

    Atomic Structure

    • Atomic Number: The number of protons in an atom's nucleus. This determines the element.
    • Atomic Mass Number: The total number of protons and neutrons in the nucleus.
    • Electrons: Negatively charged particles orbiting the nucleus in specific energy levels (shells).
    • Protons: Positively charged particles in the nucleus.
    • Neutrons: Neutral particles in the nucleus.

    Electron Energy Levels and Valence Electrons

    • Electron Energy Levels: Electrons occupy specific energy levels around the nucleus; first shell holds 2 electrons, second 8 etc.
    • Valence Electrons: Electrons in the outermost shell, determining chemical reactivity.

    Chemical Bonds

    • Covalent Bonds: Atoms share valence electrons to achieve a more stable configuration.
    • Ionic Bonds: One atom donates electrons to another, forming oppositely charged ions that attract.
    • Hydrogen Bonds: Weak attraction between a hydrogen atom and a highly electronegative atom (like oxygen or nitrogen).
    • Van der Waals Forces: Weak attractions between molecules due to temporary electron fluctuations.

    Hydrophobic and Hydrophilic Molecules

    • Hydrophobic: Molecules that do not interact well with water (typically nonpolar, like fats and oils).
    • Hydrophilic: Molecules that interact readily with water (typically polar, like sugars and ions).
    • Lipophilic: Molecules that interact readily with fats and oils (typically synonymous with hydrophobic).

    Macromolecules

    • Macromolecules are large polymers assembled from smaller repeating monomers.
    • Carbohydrates: Monosaccharides, serving as energy sources and structural components (cellulose).
    • Proteins: Amino acids, with diverse functions including catalysis (enzymes), structure, transport, and regulation.
    • Nucleic Acids: Nucleotides, storing and transmitting genetic information (DNA and RNA).
    • Lipids: Fats, phospholipids, and steroids, serving as energy stores, structural components, and signaling molecules.

    Storage vs. Structural Polysaccharides

    • Storage Polysaccharides: Store energy (starch in plants, glycogen in animals).
    • Structural Polysaccharides: Provide structural support (cellulose in plant cell walls, chitin in exoskeletons).

    Protein Structure

    • Primary Structure: Linear sequence of amino acids.
    • Secondary Structure: Localized folding or coiling (alpha helices, beta pleated sheets).
    • Tertiary Structure: Overall 3D shape of a polypeptide due to interactions between R groups.
    • Quaternary Structure: The structure formed when multiple polypeptide chains interact.

    Endomembrane System

    • A network of membranes in eukaryotic cells (nuclear envelope, ER, Golgi, lysosomes, vacuoles, plasma membrane).
    • They modify, package, and transport proteins/lipids.

    Diffusion and Transport

    • Diffusion: Passive movement of molecules from high to low concentration.
    • Facilitated Diffusion: Passive movement with the help of transport proteins (channels or carriers).
    • Osmosis: Diffusion of water across a selectively permeable membrane (from low to high solute concentration).
    • Active Transport: Movement against the concentration gradient, requiring energy (ATP).

    Cellular Respiration & Photosynthesis

    • Cellular Respiration: Exergonic process that breaks down glucose to generate ATP.
    • Photosynthesis: Endergonic process that converts CO2 and H2O into glucose using light energy.

    Cellular Respiration: Oxidation/Reduction

    • Oxidation: Loss of electrons.
    • Reduction: Gain of electrons.

    Cellular Respiration: Glycolysis/Krebs Cycle

    • Glycolysis: Occurs in the cytoplasm, converting glucose into pyruvate (producing ATP and NADH).
    • Citric Acid/Krebs Cycle: Occurs in the mitochondrial matrix, completely oxidizing pyruvate (producing ATP, NADH, and FADH2).

    Cell Cycle and Cell Division

    • Mitosis: Produces two identical daughter cells (growth, repair, asexual reproduction).
    • Meiosis: Produces four genetically distinct haploid daughter cells (essential for sexual reproduction).
    • Crossing Over: Exchange of genetic material between homologous chromosomes during meiosis (contributes to genetic diversity).

    Genetics

    • Complete Dominance: Dominant allele masks the recessive.
    • Incomplete Dominance: Heterozygote phenotype is intermediate.
    • Codominance: Both alleles are expressed equally in the heterozygote.
    • Sex-linked: Genes located on sex chromosomes (X or Y).

    Replication, Transcription, Translation

    • Replication: Copying DNA.
    • Transcription: Synthesizing RNA from DNA.
    • Translation: Synthesizing protein from RNA.

    Chromosomes and Chromatids

    • Chromosome Number: Does not change after replication.
    • Chromatid Number: Doubles after replication.
    • Prions: Infectious proteins causing diseases.
    • Viroids: Small circular RNA molecules infecting plants.

    Ecology Concepts

    • Populations, Communities, Ecosystems, etc: Different levels of ecological organization.
    • Dispersion patterns (random, uniform, clumped)
    • Survivorship curves.
    • Reproduction (semelparity vs iteroparity)
    • Demographic Transition
    • Energy Transfer.
    • Dominant/Keystone Species
    • Succession (primary, secondary)
    • Competition, Predation, Parasitism, Mutualism, Commensalism.
    • Mullerian Mimicry, Batesian Mimicry, Aposematic Coloration, Cryptic Coloration.
    • Adaptation and Interactions.

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    Description

    Test your knowledge on scientific hypotheses and atomic structure. This quiz covers essential concepts such as atomic number, electron energy levels, and the nature of hypotheses in science. Perfect for students studying chemistry and the scientific method.

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