BIOCHEM EXAM4 known questions

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ffloyd
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BIOCHEM EXAM4 known questions
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2011-11-13 20:42:57
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BIOCHEM EXAM4 known questions
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BIOCHEM EXAM4 known questions
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  1. The purpose of the pentose phosphate pathway is to
    A. b and c
    B. synthesize 5-carbon sugars.
    C. a and b.
    D. generate NADPH.
    E. generate ATP.
    A. b and c
    (this multiple choice question has been scrambled)
  2. Hemolotyic anemia is a result of increase in reactive oxygen speices. The manifestation of the disease is actually caused by a defect in
    _________________.
    Glucose 6-phosphate dehydrogenase
  3. The hormone ________ induces lipolysis, whereas
    the hormone ___________ inhibits the process.
    A. epinephrine; adrenaline
    B. glucagon; epinephrine
    C. glucagon; insulin
    D. epinephrine; glucagon
    E. insulin; epinephrine
    C. glucagon; insulin
    (this multiple choice question has been scrambled)
  4. Three rounds of Beta-oxicdation of palmitate results in
    ______________.
    A. Two acetyl CoA molecules
    B. Consumes 3 molecules of FADH2
    C.Three acetyl CoA molecules
    D. complete oxidation of palmitate
    E. Three enoyl CoA molecules
    C.Three acetyl CoA molecules
    (this multiple choice question has been scrambled)
  5. The carbon atoms from a faty acid with an odd number of carbons will enter the citric acid cycle as acetyl-CoA and:
    A. malate
    B. butyrate.
    C. alpha-ketoglutarate
    D. succinyl-CoA
    E. citrate.
    D. succinyl-CoA
    (this multiple choice question has been scrambled)
  6. Ketone bodies are formed in the liver and transported to the extrahepatic tissues mainly as:
    A. lactic acid
    B. beta-hydroxybutyric acid
    C. beta-hydroxybutyryl-CoA
    D. acetoacetyl-CoA
    E. acetic acid
    B. beta-hydroxybutyric acid
    (this multiple choice question has been scrambled)
  7. The elongation of fatty acids during fatty acid synthesis is
    a repetition of three reactions adding carbons from __________ after each cycle until completion.
    A. malonyl CoA
    B. malonyl ACP
    C. acetyl CoA
    D. acetyl ACP
    B. malonyl ACP
  8. Which of the following is not required in the synthesis of
    fatty acids?
    A. Acetyl-CoA
    B. Biotin
    C. HCO3- (CO2)
    D. Malonyl – CoA
    E. NADH
    E. NADH
    (this multiple choice question has been scrambled)
  9. Prostaglandins and thromboxanes are synthesized
    from _________________, a
    20-carbon fatty acid.
    Arachidonic acid
  10. How are fatty acids longer than 16 carbons formed?
    A. by one-carbon additions at the mitochondrial membrane
    B. by elongation reactions catalyzed by enzymes on the endoplasmic reticulum
    C. by elongation reactions
    catalyzed by enzymes in the liver
    D. All of the above
    E. None of the above
    B. by elongation reactions catalyzed by enzymes on the endoplasmic reticulum
    (this multiple choice question has been scrambled)
  11. Which of the following statements about the structure of
    cholesterol is true?
    A. It is completely
    B. It contains 27 carbon atoms
    C. It contains only carbon, hydrogen, oxygen and nitrogen atoms
    saturated (no double bonds)
    D. It contains four hexane
    rings fused together
    E. Only part of the carbons are derived from isoprene units
    B. It contains 27 carbon atoms
    (this multiple choice question has been scrambled)
  12. Which of the following is the biologically active form of
    vitamin D?
    A. Cholecalciferol
    B. 24,25 – dihydroxycholecalciferol
    C. 1,25-dihydroxycholecalciferol
    D. 24-choleclciferol
    E. 25-cholecalciferol
    C. 1,25-dihydroxycholecalciferol
    (this multiple choice question has been scrambled)
  13. A patient is found to have a high concentration
    of cholesterol in the blood and deposits of cholesterol under the skin. The patient is diagnosed with familial hypercholesterolemia. What is the likely cause of this condition?
    A. Lack of LDL receptors on the surfaces of nonhepatic cells.
    B. Increased secretion of the hormone epinephrine
    C. A deficiency in insulin prodution by the pancreas.
    D. Insufficient chylomicron concentration in the blood.
    E. Overproduction of lysosomal lipases.
    A. Lack of LDL receptors on the surfaces of nonhepatic cells.
    (this multiple choice question has been scrambled)
  14. Which do you expect to have the highest protein content by percent?
    A. VLDLs
    B. HDLs
    C. IDLs
    D. Chylomicrons
    E. All of the lipids above have about the same protein content.
    B. HDLs
    (this multiple choice question has been scrambled)
  15. Glutamate is the precursor for the amino acids
    glutamine, proline, and _________________.
    arginine
  16. This amino acid, in high levels, is correlated with the
    damage of cells lining the blood vessels.
    A. citrulline
    B. S-adenosylmethionine
    C. serine
    D. homocysteine
    E. cycteine
    D. homocysteine
    (this multiple choice question has been scrambled)
  17. In the transamination reaction shown below, which of the
    following are the products, X and Y?

    Glutamate >>>>>> X
    Oxaloacetate >>>> Y

    A. alanine, alpha-ketoglutarate
    B. pyruvate, alanine
    C. aspartate, alpha-ketoglutarate
    D. glutamate, alpha- ketoglutarate
    E. pyruvate, aspartate
    C. aspartate, alpha-ketoglutarate
    (this multiple choice question has been scrambled)
  18. A female neonate did well until approximately 24hrs of age when she became lethargic. Analysis of her blood revealed a drastic elevation of arginiosuccinate. Which of the following enzymic activities is most likely to be deficient in this patient?
    A. Arginiosuccinase
    B. Arginase
    C. Ornithine transcarbamoylase
    D. Arginiosuccinate synthase
    E. Carbamoyl phosphate synthetase I
    A. Arginiosuccinase
    (this multiple choice question has been scrambled)
  19. A ribose sugar is added to _____________rings after their synthesis and to ______ rings during their synthesis.
    A. purine; purine
    B. pyrimidine; pyrimidine
    C. pyrimidine; purine
    D. purine; pyrimidine
    C. pyrimidine; purine
    (this multiple choice question has been scrambled)
  20. Which is a common precursor in the de novo synthesis of purine nucleotides?
    A. xanthosine monophosphate
    B. Adenylosuccinate
    C. inosine 5’-monophosphate
    D. Orotate
    C. inosine 5’-monophosphate
    (this multiple choice question has been scrambled)

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