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MCQs

Total Questions : 25 | Page 2 of 3 pages
Question 11. . When concentration of the reactants is higher than the equilibrium concentration then
  1.    the gibbs free energy will be positive
  2.    the gibbs free energy will be negative
  3.    more products will be formed
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)
Question 12. . ATP is from which general category of molecules?
  1.    Polysaccharides
  2.    Proteins
  3.    Nucleotides
  4.    Amino acids
 Discuss Question
Answer: Option C. -> Nucleotides
Question 13. . Which of the following is not true of glycolysis?
  1.    ADP is phosphorylated to ATP via substrate level phosphorylation
  2.    The pathway does not require oxygen
  3.    The pathway oxidizes two moles of NADH to NAD+ for each mole of glucose that enters
  4.    The pathway requires two moles of ATP to get started catabo-lizing each mole of glucose
 Discuss Question
Answer: Option C. -> The pathway oxidizes two moles of NADH to NAD+ for each mole of glucose that enters
Question 14. . In glycolysis, ATP is formed by the transfer of a high-energy phosphate from 1,3-bisphosphoglycerate to ADR No such high-energy phosphate donor has ever been isolated in mitochondria because
  1.    the techniques for isolating the phosphate donor are not refined enough
  2.    no such phosphate donor exists
  3.    the high-energy phosphate donor is very short-lived and difficult to isolate
  4.    None of the above
 Discuss Question
Answer: Option B. -> no such phosphate donor exists
Question 15. . The glycolytic pathway (glucose → 2 pyruvate) is found
  1.    in all living organisms
  2.    primarily in animals excluding particles
  3.    only in eukaryotes
  4.    only in yeast
 Discuss Question
Answer: Option A. -> in all living organisms
Question 16. . 
Which of the following could act as an uncoupler of electron transport and ATP synthesis?
  1.    The Fo base-piece of ATP synthase (without the Fl subunit)
  2.    Dinitrophenol
  3.    neither (a) nor (b)
  4.    Both (a) and (b)
 Discuss Question
Answer: Option D. -> Both (a) and (b)
Question 17. . Which of the following is not a mechanism for altering the flux of metabolites through the rate-determining step of a pathway?
  1.    Allosteric control of the enzyme activity
  2.    Diffusional coupling between adjacent active sites
  3.    Genetic control of the enzyme concentration
  4.    Covalent modification of the enzyme
 Discuss Question
Answer: Option B. -> Diffusional coupling between adjacent active sites
Question 18. . Which of the following regulates glycolysis steps?
  1.    Phosphofructokinase
  2.    Hexose kinase
  3.    Pyruvate kinase
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 19. . 
Phosphofructokinase, the major flux-controlling enzyme of glycolysis is allosterically inhibited and activated respectively by
  1.    ATP and PEP
  2.    AMP and Pi
  3.    ATP and ADP
  4.    Citrate and ATP
 Discuss Question
Answer: Option C. -> ATP and ADP
Question 20. . Fructose-2,6-bisphosphate
  1.    activates fructose-1,6-bisphosphatase
  2.    activates phosphofructokinase
  3.    inhibits fructose-1,6-bisphosphatase
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)

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