Oxidative Phosphorylation(Biochemistry ) Questions and Answers

Question 1.  FAD is reduced to FADH2 during
  1.    electron transport phosphorylation
  2.    lactate fermentation
  3.    Krebs cycle
  4.    glycolysis
Explanation:-
Answer: Option C. -> Krebs cycle
Question 2.  Coenzyme Q is involved in electron transport as
  1.    directly to O2
  2.    a water-soluble electron donor
  3.    covalently attached cytochrome cofactor
  4.    a lipid-soluble electron carrier
Explanation:-
Answer: Option D. -> a lipid-soluble electron carrier
Question 3.  A biological redox reaction always involves
  1.    an oxidizing agent
  2.    a gain of electrons
  3.    a reducing agent
  4.    all of these
Explanation:-
Answer: Option D. -> all of these
Question 4.  During glycolysis, electrons removed from glucose are passed to
  1.    FAD
  2.    NAD+
  3.    acetyl CoA
  4.    pyruvic acid
Explanation:-
Answer: Option B. -> NAD+
Question 5.  The carbon dioxide is primary a product of
  1.    Krebs cycle
  2.    glycolysis
  3.    electron transport phosphorylation.
  4.    lactate fermentation.
Explanation:-
Answer: Option A. -> Krebs cycle
Question 6.  Which of the following is not a significant biological oxidizing agent?
  1.    FAD
  2.    Fe3+
  3.    O2
  4.    NAD+
Explanation:-
Answer: Option B. -> Fe3+
Question 7.  Which of the following is not a feature of oxidative phosphorylation?
  1.    Direct transfer of phosphate from a substrate molecule to ADP
  2.    An electrochemical gradient across the inner mitochondrial membrane
  3.    A membrane bound ATP synthase
  4.    A protonmotive force
Explanation:-
Answer: Option A. -> Direct transfer of phosphate from a substrate molecule to ADP
Question 8.  How many CO2 molecules are exhaled for each O2 molecule utilized in cellular respiration?
  1.    1
  2.    3
  3.    6
  4.    12
Explanation:-
Answer: Option A. -> 1
Question 9.  What happens after glycolysis when oxygen is available as an electron acceptor?
  1.    Pyruvate is formed
  2.    NADH is produced
  3.    Fermentation
  4.    Oxidative phosphorylation
Explanation:-
Answer: Option B. -> NADH is produced
Question 10. . Lactic acid is produced by human muscles during strenuous exercise because of lack of
  1.    oxygen
  2.    NAD+
  3.    glucose
  4.    ADP and Pi
Explanation:-
Answer: Option A. -> oxygen
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