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CR Biology A M1L4
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CR Biology A M1L4

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@CarefreeMeerkat

Questions and Answers

What is the primary function of genes in living organisms?

  • To form cell membranes and provide structural support
  • To encode carbohydrates for energy storage
  • To control the characteristics and traits of organisms (correct)
  • To produce organic compounds for cellular respiration

    • Which statement best describes the cell theory?

  • All living things are composed of multiple organ systems
  • All cells are identical in function and structure
  • Cells are the smallest living unit and cannot divide
  • All organisms are made of one or more cells, and all cells arise from preexisting cells (correct)

    • Which principle of biology explains how organisms adapt over time?

  • Evolution (correct)
  • Cell theory
  • Homeostasis
  • Gene theory

    • What does homeostasis refer to in living organisms?

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

    What are chromosomes primarily made of?

    <p>Deoxyribonucleic acid (DNA)</p> Signup and view all the answers

    How do genes pass characteristics from parents to offspring?

    <p>By being inherited on chromosomes during reproduction</p> Signup and view all the answers

    What is a fundamental aspect of gene theory?

    <p>Genes provide instructions for encoding proteins</p> Signup and view all the answers

    What aspect of biology does the concept of homeostasis also apply to?

    <p>The stable conditions in ecosystems and nature</p> Signup and view all the answers

    Which of the following is NOT one of the four unifying principles of biology?

    <p>Gravitational theory</p> Signup and view all the answers

    What is the starting point of life for all living organisms?

    <p>A single cell</p> Signup and view all the answers

    What primarily maintains the constant concentration of oxygen in the atmosphere?

    <p>Balance between respiration and photosynthesis</p> Signup and view all the answers

    What is natural selection primarily responsible for?

    <p>The differential reproductive success of organisms</p> Signup and view all the answers

    How do adaptations benefit living organisms?

    <p>By aiding survival and reproduction in specific environments</p> Signup and view all the answers

    What is an example of an adaptation mentioned in the content?

    <p>Tentacles around a mole's nose for touch</p> Signup and view all the answers

    Evolution, as described in the content, involves changes in what?

    <p>The characteristics of living things over time</p> Signup and view all the answers

    Which statement best describes the relationship between breathing and oxygen concentration?

    <p>Breathing removes oxygen from the atmosphere.</p> Signup and view all the answers

    What outcome results from the process of natural selection over time?

    <p>Major changes in characteristics of organisms</p> Signup and view all the answers

    Which of the following best explains how living things contribute to the changes in oxygen levels?

    <p>Both plants and animals play roles in oxygen dynamics.</p> Signup and view all the answers

    Why is the mole's touch organ considered an adaptation?

    <p>It helps the mole find food in a dark environment.</p> Signup and view all the answers

    What does evolution explain about modern living things?

    <p>They have evolved adaptations that help them survive.</p> Signup and view all the answers

    Oxygen levels in the atmosphere are maintained by a balance between living things consuming oxygen and plants producing it.

    <p>True</p> Signup and view all the answers

    Adaptations are characteristics that hinder a living thing's survival in its environment.

    <p>False</p> Signup and view all the answers

    Natural selection results in some living things producing fewer offspring over generations.

    <p>False</p> Signup and view all the answers

    All living organisms have evolved from modern forms with no connection to ancient life forms.

    <p>False</p> Signup and view all the answers

    All living organisms begin life as a single cell.

    <p>True</p> Signup and view all the answers

    The mole's tentacles aid in its ability to survive in total darkness by sense its environment.

    <p>True</p> Signup and view all the answers

    Chromosomes are composed primarily of proteins.

    <p>False</p> Signup and view all the answers

    Homeostasis refers only to the internal environment of living organisms.

    <p>False</p> Signup and view all the answers

    Genes are responsible for encoding proteins necessary for an organism's function.

    <p>True</p> Signup and view all the answers

    There are only three unifying principles of biology.

    <p>False</p> Signup and view all the answers

    Match the unifying principles of biology with their descriptions:

    <p>Cell Theory = All organisms are made up of one or more cells. Gene Theory = Characteristics of living organisms are controlled by genes. Homeostasis = Maintaining a stable internal environment. Evolution = Changes in species over time.</p> Signup and view all the answers

    Match the biological concepts with their correct definitions:

    <p>Gene = A segment of DNA encoding a protein. Chromosome = Structure that contains genes. DNA = Molecule that carries genetic instructions. Cell = Basic unit of life in organisms.</p> Signup and view all the answers

    Match the terms with their examples:

    <p>Homeostasis = Regulating body temperature. Gene Theory = Inheritance of traits from parents. Cell Theory = Development of multicellular organisms. Evolution = The adaptation of species to their environment.</p> Signup and view all the answers

    Match the processes with their roles in biology:

    <p>Metabolism = All chemical processes in an organism. Reproduction = Process of producing offspring. Heredity = Passing traits from parents to offspring. Homeostasis = Balance of internal conditions.</p> Signup and view all the answers

    Match the following statements with their corresponding principles:

    <p>Cell Theory = All life functions occur within cells. Gene Theory = Genes are passed from parents to offspring. Homeostasis = External conditions can affect internal stability. Evolution = Describes adaptation over generations.</p> Signup and view all the answers

    Match the following processes with their roles in maintaining oxygen levels:

    <p>Breathing = Removes oxygen from the atmosphere Photosynthesis = Adds oxygen to the atmosphere Respiration = Uses oxygen to produce energy Decomposition = Releases carbon dioxide into the atmosphere</p> Signup and view all the answers

    Match the following terms related to evolution with their definitions:

    <p>Natural Selection = Process where certain traits become more common Adaptation = Characteristic that aids survival in an environment Evolution = Change in living things over generations Offspring = New generation produced by living things</p> Signup and view all the answers

    Match the following adaptations to the animals they describe:

    <p>Mole's touch organ = Senses food in the dark underground Giraffe's long neck = Reaches high foliage for feeding Polar bear's thick fur = Insulates against cold weather Cheetah's speed = Chases down prey in open plains</p> Signup and view all the answers

    Match the following concepts with their characteristics:

    <p>Evolution = Involves descent from ancient life forms Homeostasis = Maintains stable internal conditions Photosynthesis = Occurs in plants to produce energy Gene Theory = Explains inheritance of traits through genes</p> Signup and view all the answers

    Match the following elements of the ecosystem with their roles:

    <p>Plants = Producers of oxygen through photosynthesis Animals = Consumers that depend on oxygen Decomposers = Recycle nutrients back into the soil Soil = Habitat for various organisms including moles</p> Signup and view all the answers

    Study Notes

    Characteristics of Life

    • Genes, located on chromosomes, control the physical traits of all organisms and are inherited from parents.
    • Gene theory is one of four unifying principles of biology essential for understanding life.

    Four Unifying Principles of Biology

    • Cell Theory: All organisms consist of one or more cells, with life functions occurring within cells, and all cells arise from preexisting cells.
    • Gene Theory: Characteristics are controlled by genes, segments of DNA that encode proteins, found on chromosomes inside cells.
    • Homeostasis: The process of maintaining a stable internal environment, applicable to organisms and nature, exemplified by the constant 21% oxygen concentration in the atmosphere.
    • Evolution: The process of change in living things over time driven by natural selection, where organisms with favorable traits are more likely to reproduce.

    The Cell Theory

    • All organisms originate from a single cell, with complex organisms developing from that initial cell.
    • Humans are composed of approximately 100 trillion cells, all arising from cell division.

    The Gene Theory

    • Genes instruct cells on their functions by encoding proteins.
    • Chromosomes house genes, which are essential for passing traits to the next generation.

    Homeostasis

    • Living organisms help maintain environmental stability; for example, oxygen levels are balanced by the respiration of animals and the photosynthesis of plants.
    • This interplay of consumption and production contributes to ecological balance and homeostasis.

    Evolution

    • Natural selection leads to the evolution of species, as organisms that produce more offspring dominate future generations.
    • Adaptations, traits that improve survival in specific environments, are fundamental to evolutionary success.
    • Example: Moles have specialized touch organs to detect food in their dark underground habitat, enhancing their chances of survival.

    Characteristics of Life

    • Genes, located on chromosomes, control the physical traits of all organisms and are inherited from parents.
    • Gene theory is one of four unifying principles of biology essential for understanding life.

    Four Unifying Principles of Biology

    • Cell Theory: All organisms consist of one or more cells, with life functions occurring within cells, and all cells arise from preexisting cells.
    • Gene Theory: Characteristics are controlled by genes, segments of DNA that encode proteins, found on chromosomes inside cells.
    • Homeostasis: The process of maintaining a stable internal environment, applicable to organisms and nature, exemplified by the constant 21% oxygen concentration in the atmosphere.
    • Evolution: The process of change in living things over time driven by natural selection, where organisms with favorable traits are more likely to reproduce.

    The Cell Theory

    • All organisms originate from a single cell, with complex organisms developing from that initial cell.
    • Humans are composed of approximately 100 trillion cells, all arising from cell division.

    The Gene Theory

    • Genes instruct cells on their functions by encoding proteins.
    • Chromosomes house genes, which are essential for passing traits to the next generation.

    Homeostasis

    • Living organisms help maintain environmental stability; for example, oxygen levels are balanced by the respiration of animals and the photosynthesis of plants.
    • This interplay of consumption and production contributes to ecological balance and homeostasis.

    Evolution

    • Natural selection leads to the evolution of species, as organisms that produce more offspring dominate future generations.
    • Adaptations, traits that improve survival in specific environments, are fundamental to evolutionary success.
    • Example: Moles have specialized touch organs to detect food in their dark underground habitat, enhancing their chances of survival.

    Characteristics of Life

    • Genes, located on chromosomes, control the physical traits of all organisms and are inherited from parents.
    • Gene theory is one of four unifying principles of biology essential for understanding life.

    Four Unifying Principles of Biology

    • Cell Theory: All organisms consist of one or more cells, with life functions occurring within cells, and all cells arise from preexisting cells.
    • Gene Theory: Characteristics are controlled by genes, segments of DNA that encode proteins, found on chromosomes inside cells.
    • Homeostasis: The process of maintaining a stable internal environment, applicable to organisms and nature, exemplified by the constant 21% oxygen concentration in the atmosphere.
    • Evolution: The process of change in living things over time driven by natural selection, where organisms with favorable traits are more likely to reproduce.

    The Cell Theory

    • All organisms originate from a single cell, with complex organisms developing from that initial cell.
    • Humans are composed of approximately 100 trillion cells, all arising from cell division.

    The Gene Theory

    • Genes instruct cells on their functions by encoding proteins.
    • Chromosomes house genes, which are essential for passing traits to the next generation.

    Homeostasis

    • Living organisms help maintain environmental stability; for example, oxygen levels are balanced by the respiration of animals and the photosynthesis of plants.
    • This interplay of consumption and production contributes to ecological balance and homeostasis.

    Evolution

    • Natural selection leads to the evolution of species, as organisms that produce more offspring dominate future generations.
    • Adaptations, traits that improve survival in specific environments, are fundamental to evolutionary success.
    • Example: Moles have specialized touch organs to detect food in their dark underground habitat, enhancing their chances of survival.

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    Description

    Explore the essential characteristics of life and the four unifying principles of biology, including Cell Theory, Gene Theory, Homeostasis, and Evolution. Understand the importance of genes in determining traits and how they relate to the overall functioning of living organisms. Test your knowledge on these foundational concepts of biological science.

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