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MCQs

Total Questions : 25 | Page 1 of 3 pages
Question 1.  Glycolytic pathway regulation involves
  1.    allosteric stimulation by ADP
  2.    allosteric inhibition by ATP
  3.    feedback, or product, inhibition by ATP
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 2.  During catabolism, only about 40% of the energy available from oxidizing glucose is used to synthesize ATP. Remaining 60%
  1.    is lost as heat
  2.    is used to reduce NADP
  3.    remains in the products of metabolism
  4.    is stored as fat.
 Discuss Question
Answer: Option A. -> is lost as heat
Question 3.  A kinase is an enzyme that
  1.    removes phosphate groups of substrates
  2.    uses ATP to add a phosphate group to the substrate
  3.    uses NADH to change the oxidation state of the substrate
  4.    removes water from a double bond
 Discuss Question
Answer: Option B. -> uses ATP to add a phosphate group to the substrate
Question 4.  Why does the glycolytic pathway continue in the direction of glucose catabolism?
  1.    There are essentially three irreversible reactions that act as the driving force for the pathway
  2.    High levels of ATP keep the pathway going in a forward direction
  3.    The enzymes of glycolysis only function in one direction
  4.    Glycolysis occurs in either direction
 Discuss Question
Answer: Option A. -> There are essentially three irreversible reactions that act as the driving force for the pathway
Question 5.  The released energy obtained by oxidation of glucose is stored as
  1.    a concentration gradient across a membrane
  2.    ADP
  3.    ATP
  4.    NAD+
 Discuss Question
Answer: Option C. -> ATP
Question 6.  For every one molecule of sugar glucose which is oxidized __________ molecule of pyruvic acid are produced.
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Question 7.  In the glycogen synthase reaction, the precursor to glycogen is
  1.    glucose-6-P
  2.    UTP-glucose
  3.    UDP-glucose
  4.    glucose-1-P
 Discuss Question
Answer: Option C. -> UDP-glucose
Question 8.  
The active form of glycogen phosphorylase is phosphorylated, while the dephosphorylation of which active form occurs?
  1.    Glycogen synthase
  2.    Glycogen semisynthase
  3.    Glycogen hydrolase
  4.    Glycogen dehydrogenase
 Discuss Question
Answer: Option A. -> Glycogen synthase
Question 9.  The amount of energy received from one ATP is
  1.    76 kcal
  2.    7.3 kcal
  3.    760 kcal
  4.    1000 kcal
 Discuss Question
Answer: Option B. -> 7.3 kcal
Question 10. . The enzymes of glycolysis in a eukaryotic cell are located in the
  1.    intermembrane space
  2.    plasma membrane
  3.    cytosol
  4.    mitochondrial matrix
 Discuss Question
Answer: Option C. -> cytosol

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