Biology 1406 Chap 9

Last update by garydfreeman on 11/13/2012
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which of these enters the citric acid cycle?

A) G3P
B) pyruvate
C) acetyl CoA

Answer:
acetyl CoA

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  • garydfreeman
    In the citric acid cycle, ATP molecules are produced by _____.

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    B) photophosphorylation
    C) substrate-level phosphorylation
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    Which of these is NOT a product of the citric acid cycle?

    A) FADH2
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  • garydfreeman

    When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes

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    B) hydrogenated.

    C) oxidized.

    D) reduced.

    E) an oxidizing agent.


    oxidized
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    Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during glycolysis?

    A) 0%

    B) 2%

    C) 10%

    D) 38%

    E) 100%

    100%
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    In addition to ATP, what are the end products of glycolysis?

    A) CO2 and H20
    B) CO2 and pyruvate
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    The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mole and the free energy for the reduction of NAD+ to NADH is +53 kcal/mole. Why are only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed?

    A) Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis.
    B) There is no CO2 or water produced as products of glycolysis.
    C) Glycolysis consists of many enzymatic reactions, each of which extracts some energy from the glucose molecule.
    Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis.
  • garydfreeman
    In glycolysis, for each molecule of glucose oxidized to pyruvate


    A) 2 molecules of ATP are used and2 molecules of ATP are produced. B) 2 molecules of ATP are used and 4 molecules of ATP are produced. C) 4 molecules of ATP are used and 2 molecules of ATP are produced. D) 2 molecules of ATP are used and 6 molecules of ATP are produced. E) 6 moleculesof ATP are used and 6 molecules of ATP are produced.
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    Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO2) from one molecule of pyruvate?
    A) acetyl CoA
    B) lactate
    C) oxaloacetate
    acetyl CoA
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    Which of the following occurs in the cytosol of a eukaryotic cell?

    A) oxidative phosphorylation
    B) citric acid cycle
    C) glycolysis and fermintation
    glycolysis and fermination
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