Biology Exam Study Guide Flashcards
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Biology Exam Study Guide Flashcards

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Questions and Answers

What is the biosphere?

  • A specific ecosystem
  • Only the land areas of the Earth
  • The zone of life on Earth
  • All parts of the planet with living things (correct)
  • What is a cell?

    Basic unit of life

    What is cell specialization?

    The process in which cells develop in different ways to perform different tasks

    Define eukaryotes.

    <p>Organisms made up of one or more cells that have a nucleus and membrane-bound organelles</p> Signup and view all the answers

    What does homeostasis mean?

    <p>The maintenance of stable internal conditions</p> Signup and view all the answers

    List the levels of structural organization.

    <p>Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species</p> Signup and view all the answers

    What are populations?

    <p>Groups of individuals that belong to the same species and live in the same area</p> Signup and view all the answers

    What are prokaryotes?

    <p>Single-celled organisms that do not have a membrane-bound nucleus</p> Signup and view all the answers

    Define species.

    <p>Group of similar organisms that can breed and produce fertile offspring</p> Signup and view all the answers

    What are the themes of biology?

    <p>Energy/system interactions, structure and function, unity with diversity, evolution, homeostasis, cooperation</p> Signup and view all the answers

    What are controlled experiments?

    <p>An experiment in which only one variable is manipulated at a time</p> Signup and view all the answers

    What is data in the context of biology?

    <p>Information gathered from observations</p> Signup and view all the answers

    What is a hypothesis?

    <p>Possible explanation for a set of observations or a suggested answer to a scientific question</p> Signup and view all the answers

    What is a conclusion in scientific research?

    <p>Restates hypothesis, states if it was correct, and explains why or why not</p> Signup and view all the answers

    What is an inference?

    <p>Logical conclusion</p> Signup and view all the answers

    Define theory in scientific terms.

    <p>Well-tested explanation that unifies a broad range of observations</p> Signup and view all the answers

    What are variables in an experiment?

    <p>Factors that can change in an experiment</p> Signup and view all the answers

    What is atomic mass?

    <p>Total mass of the protons and neutrons in an atom, measured in atomic mass units</p> Signup and view all the answers

    Define atomic number.

    <p>The number of protons in the nucleus of an atom</p> Signup and view all the answers

    What are chemical reactions?

    <p>Breaking of old and formation of new chemical bonds that result in new substances</p> Signup and view all the answers

    What are compounds?

    <p>Combination of 2 or more elements</p> Signup and view all the answers

    Define ions.

    <p>Electrically charged atoms that have gained or lost electrons</p> Signup and view all the answers

    What are isotopes?

    <p>Atoms of the same element that have different numbers of neutrons</p> Signup and view all the answers

    What are nonpolar molecules?

    <p>Molecules that have an equal distribution of electrical charge across all its constituent atoms</p> Signup and view all the answers

    What is pH a measure of?

    <p>How acidic or basic a solution is</p> Signup and view all the answers

    Define polar molecules.

    <p>Molecules in which the charges are unevenly distributed</p> Signup and view all the answers

    What are products in a chemical reaction?

    <p>The elements or compounds produced by a chemical reaction</p> Signup and view all the answers

    What are radioactive isotopes?

    <p>Atoms that are unstable and decay to form stable atoms of a different element</p> Signup and view all the answers

    Define reactants.

    <p>The elements or compounds that enter into a chemical reaction</p> Signup and view all the answers

    What is a solute?

    <p>The dissolved substance in a solution</p> Signup and view all the answers

    What is a solution?

    <p>A mixture in which one substance is dissolved in another</p> Signup and view all the answers

    What is a solvent?

    <p>A liquid substance capable of dissolving other substances</p> Signup and view all the answers

    List the subatomic particles and their characteristics.

    <p>Proton (+), neutron (0), electron (-)</p> Signup and view all the answers

    What are the types of chemical bonds?

    <p>Hydrogen, covalent, ionic</p> Signup and view all the answers

    What are amino acids?

    <p>Simple forms of protein normally used to build tissues or burned for energy</p> Signup and view all the answers

    What are carbohydrates?

    <p>Main source of energy for the body</p> Signup and view all the answers

    What is a catalyst?

    <p>Substance that speeds up the rate of a chemical reaction</p> Signup and view all the answers

    What is an enzyme?

    <p>Specialized proteins that speed up chemical reactions</p> Signup and view all the answers

    What are inorganic molecules?

    <p>Non-carbon based molecules</p> Signup and view all the answers

    What are lipids?

    <p>Nonpolar molecules that are not soluble or mostly insoluble in water</p> Signup and view all the answers

    What are nucleic acids?

    <p>Very long organic compounds made of carbon, hydrogen, nitrogen, and phosphorous, containing instructions that cells need to carry out all the functions of life</p> Signup and view all the answers

    Study Notes

    Key Biological Concepts

    • Biosphere: Encompasses all regions of Earth where life exists, including land, water, and atmosphere.
    • Cell: Fundamental unit of life, serving as the building blocks of all living organisms.
    • Cell Specialization: The process by which cells differentiate to fulfill various functions, contributing to complex organism functionality.
    • Eukaryotes: Organisms with one or more cells featuring a defined nucleus and membrane-bound organelles, e.g., animals, plants.
    • Prokaryotes: Simplistic, single-celled organisms without a membrane-bound nucleus, e.g., bacteria.
    • Homeostasis: Mechanisms that organisms employ to maintain stable internal environments despite external changes.

    Organization of Life

    • Levels of Structural Organization: Hierarchical categorization including Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
    • Populations: Entities comprising groups of individuals from the same species residing in the same geographical area.
    • Species: Groups of similar organisms capable of breeding and producing fertile offspring.

    Research and Experimentation

    • Controlled Experiments: Experimental setups that manipulate one variable at a time to isolate effects.
    • Hypothesis: Proposed explanation based on initial observations, forming the basis for further experimentation.
    • Data: Collected information derived from observations that inform conclusions.
    • Conclusion: Summarization of findings, re-evaluating the hypothesis and suggesting alternative approaches if needed.
    • Inference: Logical deductions drawn from collected data.

    Chemical Foundations

    • Atomic Mass: Total mass of an atom, calculated as the sum of its protons and neutrons, expressed in atomic mass units.
    • Atomic Number: Unique count of protons in an atom's nucleus that defines the element.
    • Chemical Reactions: Processes involving the breaking and formation of chemical bonds, resulting in new substances.
    • Compounds: Substances formed from the combination of two or more elements.
    • Ions: Atoms with an electrical charge due to loss or gain of electrons.
    • Isotopes: Variants of the same element that differ in neutron count.

    Molecular Properties

    • Polar Molecules: Molecules with uneven charge distribution, allowing for specific interactions with other polar substances.
    • Nonpolar Molecules: Molecules that maintain an even distribution of charge, resulting in no polarization.
    • pH: Numerical scale measuring the acidity or alkalinity of a solution, critical for biological processes.

    Biological Macromolecules

    • Amino Acids: Basic units of proteins, playing roles in building tissues and energy production.
    • Carbohydrates: Primary energy source for organisms, including sugars and starches.
    • Lipids: A diverse group of nonpolar molecules insoluble in water; include fats and oils.
    • Nucleic Acids: Large organic molecules essential for storing and transmitting genetic information; include DNA and RNA.

    Catalysts and Reactions

    • Catalyst: Substance that accelerates a chemical reaction without being consumed.
    • Enzyme: Biocatalysts that are specialized proteins enhancing reaction rates, vital for metabolic processes.

    Types of Chemical Bonds

    • Types of Chemical Bonds: Include hydrogen bonds (weak attractions), covalent bonds (shared electrons), and ionic bonds (transfer of electrons).

    Additional Concepts

    • Radioactive Isotopes: Unstable isotopes that undergo decay, transforming into more stable forms of different elements.
    • Solute: Substance dissolved in a solution, generally present in lesser quantities.
    • Solvent: Substance, often a liquid, in which solutes are dissolved to form a solution.
    • Solution: Homogeneous mixture resulting from the dissolution of a solute in a solvent.

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    Prepare for your biology exam with these concise flashcards. Each card highlights key terms and definitions related to the biosphere, cells, and cell specialization. Perfect for quick revisions and enhancing your understanding of fundamental biological concepts.

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