Biochem Test #2

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Anonymous
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41490
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Biochem Test #2
Updated:
2010-10-11 20:02:09
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biochem
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  1. Which of the following coenzymes is NOT required for the activity of the pyrivate degydrogenase activity?

    A. Thiamin pyrophosphate
    B. Biotin
    C. NAD
    D. FAD
    E. Coenzyme A
    B. Biotin
    (this multiple choice question has been scrambled)
  2. Which of the following cellular conditions increases the oxidation of acetyl CoA by the Krebs cycle?

    A. a high ATP/ADP ratio
    B. a high NAD/NADH ratio
    C. a high level of NADH
    D. a high GTP/GDP ratio
    E. a low concentration of AMP
    B. a high NAD/NADH ratio
    (this multiple choice question has been scrambled)
  3. Which of the following statements regarding control of glycolysis in liver is correct?

    A. Fructose 2,6-bisphosphate is a negative allosteric effector of PFK-1
    B. the glycolytic enzyme that is most highly regulated is PFK-1
    C. High levels of insulin lead to phosphorylation of PFK-2
    D. dephosphorylation of fructose-bisphosphatase-2 increases its activity
    E. high levels of fructose 2,6-bisphosphate allosterically activate PFK-2
    B. the glycolytic enzyme that is most higly reulated is PFK-1
    (this multiple choice question has been scrambled)
  4. High energy reducing equivalents in the protein, carb and lipid that we eat are usually associated with the .... atoms removed from these nutrients during metabolism

    A. oxygen
    B. carbon
    C. sulfur
    D. nitrogen
    E. hydrogen
    E. hydrogen
    (this multiple choice question has been scrambled)
  5. In an untreated Type 1 diabetic, glucose metabolism in resting skeletal muscle cells is limited most by:

    A. transport protein needed for glucose uptake
    B. transport protein causing net glucose release
    C. enzymes needed for glucose synthesis
    D. enzymes needed for glucose oxidation
    A. transport protein needed for glucose uptake
    (this multiple choice question has been scrambled)
  6. Which of the following is a single (one) metabolic reaction?

    A. conversion of tryptophan to acetoacetate
    B. transport of glucose into cells
    C. transport of tryptophan into cells
    D. anaerobic glycolysis
    E. conversion of lactate to pyrivate
    E. conversion of lactate to pyruvate
    (this multiple choice question has been scrambled)
  7. Which of the following are products of catabolism that are used to drive anabolism?

    A. NADPH and ADP
    B. NADP+ and ATP
    C. NADPH and ATP
    D. ADP and ATP
    E. NADP- and ADP
    C. NADPH and ATP
    (this multiple choice question has been scrambled)
  8. When blood glucose levels rise after a carb-containing meal, hepatocytes take up more glucose because:

    A. insulin rises and causes hepatocyte glucose transporters to move to the plasma membrane
    B. hexokinase has a very high Vmax
    C. hexokinase has a low Km and can therefore phosphorylate large amounts of glucose
    D. the activity of glucokinase increases when blood glucose levels rise
    E. glucokinase is allosterically activated by amino acids derived from proteins in a meal
    D. the activity of glucokinase increases when blood glucose levels rise
    (this multiple choice question has been scrambled)
  9. In an individual facing physical danger, epinephrine acting on the liver will .... glycolysis and .... gluconeogenesis.

    A. inhibit, stimulate
    B. stimulate, stimulate
    C. inhibit, inhibit
    D. stimulate, inhibit
    E. stimulate, have no effect on
    A. inhibit, stimulate
    (this multiple choice question has been scrambled)

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