Chapter 8-10

Last update by Schnyder on 04/23/2012
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Where do the reactions of glycolysis occur in a eukaryotic cell? (eText Concept 9.1)

a. the matrix of the mitochondrion

b. across the inner membrane of the mitochondrion

c. in the intermembrane space of the mitochondrion

d. the cytosol

e. the inner membrane of the mitochondrion

Answer:
d. the cytosol

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  • smiraclelynch
    Answered in Chapter 8-10

    Which process is the one in which glucose is oxidized to generate two molecules of pyruvate, and in which ATP and NADH are produced? (eText Concept 9.1)

    a. chemiosmosis

    b. fermentation

    c. the oxidation of pyruvate

    d. the citric acid cycle

    e. None of the listed responses is correct.

    e. None of the listed responses is correct.
  • smiraclelynch
    Answered in Chapter 8-10

    A chemist has discovered a drug that blocks phosphoglucoisomerase, an enzyme that catalyzes the second reaction in glycolysis. He wants to use the drug to kill bacteria in people with infections. However, he cannot do this because _____. (eText Concept 9.2)

    a. this step in the pathway of glycolysis can be skipped in bacteria, but not in humans

    b. human cells must also perform glycolysis; the drug might also poison them

    c. bacteria are prokaryotes; they usually don't need to perform glycolysis

    d. glycolysis produces so little ATP that the drug will have little effect

    e. glycolysis can occur without the action of enzymes

    b. human cells must also perform glycolysis; the drug might also poison them
  • smiraclelynch
    Answered in Chapter 8-10

    In glycolysis, there is no production of carbon dioxide as a product of the pathway. Which of the following is the best explanation for this? (eText Concept 9.2)

    a. The initial steps of glycolysis require an input of energy in the form of ATP (two per glucose).

    b. There is very little ATP produced in glycolysis.

    c. The products of glycolysis contain the same total number of carbon atoms as in the starting material.

    d. There are no oxidation or reduction reactions in glycolysis to produce CO2.

    e. Glucose contains more carbons than the number of carbons found in the pyruvate products that are produced by glycolysis.

    c. The products of glycolysis contain the same total number of carbon atoms as in the starting material.
  • smiraclelynch
    Answered in Chapter 8-10

    Of the following molecules in the glycolytic pathway (the process of glycolysis), the one with the most chemical energy is _____. (eText Concept 9.2)

    a. pyruvate

    b. glucose

    c. fructose-1,6-bisphosphate

    d. fructose-6-phosphate

    e. glyceraldehyde-3-phosphate

    c. fructose-1,6-bisphosphate
  • smiraclelynch
    Answered in Chapter 8-10

    Most of the NADH that delivers electrons to the electron transport chain comes from which of the following processes? (eText Concept 9.3)

    a. glycolysis

    b. substrate-level phosphorylation

    c. oxidative phosphorylation

    d. anabolic pathways

    e. the citric acid cycle

    e. the citric acid cycle
  • smiraclelynch
    Answered in Chapter 8-10

    In an experiment, mice were fed glucose (C6H12O6) containing a small amount of radioactive oxygen. The mice were closely monitored, and after a few minutes radioactive oxygen atoms showed up in _____. (eText Concept 9.3)

    a. NADH

    b. oxygen gas

    c. water

    d. ATP

    e. carbon dioxide

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  • smiraclelynch
    Answered in Chapter 8-10

    In preparing pyruvate to enter the citric acid cycle, which of the following steps occurs? (eText Concept 9.3)

    a. Pyruvate is oxidized and decarboxylated, and the removed electrons are used to reduce an NAD+ to an NADH.

    b. Pyruvate is reduced and decarboxylated, and the resulting electrons oxidize an NAD+ to an NADH

    c. Pyruvate is oxidized and decarboxylated, and the resulting electrons are donated to NADH to produce NAD+.

    d. Pyruvate is reduced to acetyl-coA, which involves the reduction of pyruvate, the addition of a carbon dioxide from the environment, and its reduction by NADH.

    e. Pyruvate is ionized directly to acetyl-coA.

    a. Pyruvate is oxidized and decarboxylated, and the removed electrons are used to reduce an NAD+ to an NADH

  • smiraclelynch
    Answered in Chapter 8-10

    Why is the citric acid cycle called a cycle? (eText Concept 9.3)

    a. NAD+ and FAD are recycled.

    b. The acetyl CoA that enters the cycle is regenerated in the last step of the pathway.

    c. NADH is cycled down the electron transport chain.

    d. The four-carbon acid that accepts the acetyl CoA in the first step of the cycle is regenerated by the last step of the cycle.

    e. All of the carbon from glucose is cycled back into the atmosphere as carbon dioxide.

    d. The four-carbon acid that accepts the acetyl CoA in the first step of the cycle is regenerated by the last step of the cycle.

  • smiraclelynch
    Answered in Chapter 8-10

    In the citric acid cycle, for each pyruvate that enters the cycle, one ATP, three NADH, and one FADH2 are produced. For each glucose molecule that enters glycolysis, how many ATP, NADH, and FADH2 are produced in the citric acid cycle? (eText Concept 9.3)

    a. about 38 ATP

    b. two ATP, six NADH, two FADH2

    c. four ATP, six NADH, two FADH2

    d. one ATP, three NADH, one FADH2

    e. three ATP, three NADH, one FADH2

    b. two ATP, six NADH, two FADH2

  • smiraclelynch
    Answered in Chapter 8-10

    Where do the reactions of the citric acid cycle occur in eukaryotic cells? (eText Concept 9.3)

    a. across the inner membrane of the mitochondrion

    b. the intermembrane space of the mitochondrion

    c. the matrix of the mitochondrion

    d. the cytosol

    e. the cristae of the mitochondrion

    c. the matrix of the mitochondrion
  • smiraclelynch
    Answered in Chapter 8-10

    How many molecules of ATP are gained by substrate-level phosphorylation from the complete breakdown of a single molecule of glucose in the presence of oxygen? (eText Concept 9.3)

    a. two

    b. four

    c. about 16 ATP

    d. three

    e. about 32 ATP

    b. four