BIO TEST 2 review 2

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ndumas2
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141630
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BIO TEST 2 review 2
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2012-03-14 20:14:25
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Biology LSU Exam
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Second review for bio test
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  1. The main lipids found in cell membranes are what?
    phospholipids.
  2. In general, which of the following is
    largely responsible for moving substances across the plasma membrane,
    communicating with other cells, and identifying the cell?

    a. phospholipids
    b. carbohydrates
    c. proteins
    d. nucleic acids
    e. cytoskeleton
    proteins
  3. Plasma membranes are BEST described as a what?
    double layer of phospholipids with hydrophobic tails oriented toward one another.
  4. When a mouse cell and a human cell are fused, the membrane proteins of the two cells become uniformly distributed over the surface of the hybrid cell. This occurs
    because?
    many proteins can move around within the bilayer.
  5. Cell membranes do all of the following EXCEPT which one?

    a. isolate the cell's contents from the external environment.
    b. communicate with other cells.
    c. regulate the movement of substances between the cell and the extracellular fluid.
    d. provide attachments between cells.
    e. provide shape and structure to a cell.
    regulate the movement of substances between the cell and the extracellular fluid.
  6. The rate of facilitated diffusion of a molecule across a membrane will increase as the concentration gradient of the molecule across the membrane increases to a certain point. Eventually, an increase in the concentration of the molecule will not cause any further increase in facilitated diffusion. This is because what?
    there are a limited number of carrier proteins in the membrane.
  7. To say that a cell is "selectively permeable" means what?

    a. it has different-sized perforations in the membrane.
    b. it is permeable to different substances than other cells.
    c. only certain molecules can pass through.
    d. sometimes water passes through, and sometimes it can't.
    e. permeability depends on gradient differences.
    only certain molecules can pass through.
  8. The process in which white blood cells engulf bacteria is termed what?

    a. recognition.
    b. exocytosis.
    c. pinocytosis.
    d. phagocytosis.
    e. reception.
    phagocytosis
  9. Two aqueous solutions are separated by a selectively permeable membrane that allows water to pass through but does not allow starch to pass through. Solution A is 10% starch and solution B is 5% starch. What will occur?

    a. Water will diffuse from solution A to solution B.
    b. Water will diffuse from solution B to solution A.
    c. Starch will diffuse from solution A to solution B.
    d. Starch will diffuse from solution B to solution A.
    e. Both water and starch will diffuse from solution B to solution A.
    Water will diffuse from solution B to solution A.
  10. Cells use exocytosis to do what?

    a. move away from danger.
    b. release substances from the cell.
    c. ingest nutrients.
    d. pump hydrogen molecules across the membrane.
    e. create new cells.
    release substances from the cell.
  11. What is the correct order of the steps below as they relate to enzyme catalysis?

    1. The substrate and enzyme change shape.
    2. The substrate enters the active site.
    3. The enzyme reverts to its original configuration.
    4. The product is expelled.
    2, 1, 4, 3
  12. Which of these statements regarding enzymes is FALSE?

    a. Enzymes are proteins that function as biological catalysts.
    b. Enzymes display specificity for certain molecules to which they attach.

    c. Enzymes provide energy for the reactions they catalyze.
    d. The activity of enzymes can be regulated by factors in their environment.
    e. An enzyme may be used many times for a specific reaction.
    Enzymes provide energy for the reactions they catalyze.
  13. Which of the following is the organic molecule that is sometimes required for certain enzyme activity?

    a. an accessory enzyme
    b. an allosteric enzyme
    c. a coenzyme
    d. a functional group
    e. an activator
    a coenzyme
  14. Energy is defined as the capacity to do work. True or False?
    True
  15. Competitive and noncompetitive enzyme inhibitors differ with respect to what property?

    a. the precise location on the enzyme to which they bind.
    b. their pH.
    c. their binding affinities.
    d. their energies of activation.
    the precise location on the enzyme to which they bind.
  16. Imagine you are conducting an experiment on a yeast enzyme known as sucrase. This enzyme is used by yeast cells to break down sucrose into glucose and fructose. What type of reaction is this?

    a. metergonic
    b. exergonic
    c. endergonic
    d. spontaneous
    e. NONE of the above
    exergonic
  17. All of the following statements are true
    of the first law of thermodynamics EXCEPT which one?

    a. the amount of useful energy decreases.
    b. the first law of thermodynamics is often called the law of the conservation of energy.
    c. the total amount of energy within an isolated system remains the same.
    d. one form of energy may be converted to a different form of energy.
    e. NONE of the above
    the amount of useful energy decreases.
  18. Preservatives such as citric acid are added to foods to interfere with bacterial growth. This creates an acidic pH in the food. Why does this affect the bacteria that are present?
    An acidic environment causes bacterial enzymes to fail or work less efficiently.
  19. What is the ultimate source of energy for almost all forms of life on Earth?

    a. heat energy
    b. solar energy
    c. thermal energy
    d. chemical energy
    e. nuclear energy
    solar energy
  20. Light reactions produce:

    a. ATP, NADPH, and CO2.
    b. ATP, NADPH, and H2O.
    c. glucose, ATP, and O2.
    d. ATP, NADPH, and O2.
    e. glucose, ATP, and CO2.
    ATP, NADPH, and O2.
  21. Specifically, molecules of chlorophyll are located in the
    membranes of sacs called:

    a. stroma.
    b. thylakoids.
    c. stoma.
    d. vesicles.
    e. grana.
    thylakoids
  22. Before photosynthesis evolved, ________ was rare in Earth's atmosphere.

    a. air
    b. O2
    c. N2
    d. CO2
    e. H2O
    O2
  23. In C4 photosynthesis, where does the carbon in newly synthesized glucose come from?

    a. enzymes
    b. chlorophyll
    c. water
    d. ATP and NADPH
    e. atmospheric CO2
    atmospheric CO2
  24. The role of water in photosynthesis is to:

    a. provide electrons.
    b. provide H2.
    c. provide oxygen.
    d. maintain turgor pressure.
    e. NONE of the above answers
    provide electrons.
  25. During photosynthesis, when is CO2 utilized?

    a. during the light reactions only
    b. during the Calvin cycle only
    c. during both the light reactions and the Calvin cycle
    d. during neither the light reactions nor the Calvin cycle
    e. NONE of the above answers
    during the Calvin cycle only
  26. Carbon dioxide is required in the light reactions of photosynthesis. True or False?
    False
  27. Suppose that you are experimenting with different types of lighting for your indoor green plants. Which of the following colors of light

    will be most effective?

    a. blue
    b. red & blue
    c. green
    d. orange & yellow
    e. red & green
    red & blue
  28. The products of photosynthesis are:
    a. carbon dioxide, water, and energy.
    b. glucose and water.
    c. glucose and oxygen.
    d. glucose and carbon dioxide.
    e. carbon dioxide, chlorophyll, and oxygen.
    glucose and oxygen.
  29. NADPH is synthesized during which of the following reactions?

    a. the light reactions only
    b. the Calvin cycle only
    c. both the light reactions and the Calvin cycle
    d. neither the light reactions nor the Calvin cycle
    e. NONE of the above answers
    the light reactions only

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