Atp Synthesis And Fatty Acid Oxidation(Biochemistry ) Questions and Answers

Question 1. Membrane potential and the proton gradient
  1.    cancel one another when uncouplers are present
  2.    are sufficient, separately, to make ATP from ADP + Pi;
  3.    are both required to make ATP
  4.    reinforce one another when respiratory inhibitors are present
Explanation:-
Answer: Option C. -> are both required to make ATP
Question 2. Long-chain fatty acids are oxidized step-wise in one carbon units starting from the
  1.    none of these
  2.    carboxyl end
  3.    aliphatic end
  4.    both (a) and (b)
Explanation:-
Answer: Option B. -> carboxyl end
Question 3. The oxidation of methanol (wood alcohol) in human retina tissue leads directly to the formation of
  1.    formaldehyde
  2.    sugars
  3.    CO2
  4.    none of these
Explanation:-
Answer: Option A. -> formaldehyde
Question 4. How many molecules of acetyl-CoA are produced in oxidation of palmitic acid (C16), which involves seven rounds of oxidation?
  1.    7
  2.    6
  3.    9
  4.    8
Explanation:-
Answer: Option D. -> 8
Question 5. The irreversibility of the thiokinase reactions (formation of initial acyl-CoA)
  1.    make this activation reaction the committed step on the pathway
  2.    both (a) and (b)
  3.    is due to the subsequent hydrolysis of the product
  4.    applies only to even-chain fatty acids
Explanation:-
Answer: Option B. -> both (a) and (b)
Question 6. The maximum energy per gram on oxidization is yielded from
  1.    fat
  2.    starch
  3.    glycogen
  4.    protein
Explanation:-
Answer: Option A. -> fat
Question 7. The three identical b subunits of the F1, complex during ATP synthesis have
  1.    different affinities for ADP but not for ATP
  2.    different affinities for ATP but not for ADP
  3.    different affinities for ATP and for ADP
  4.    similar affinities for ADP and ATP
Explanation:-
Answer: Option C. -> different affinities for ATP and for ADP
Question 8. Where the acyl-CoA formed in the cytosol is transported for oxidation?
  1.    Endoplasmic reticulum
  2.    Microsomes
  3.    Remains in cytosol
  4.    Mitochondrial matrix
Explanation:-
Answer: Option D. -> Mitochondrial matrix
Question 9. The oxidation of methanol (wood alcohol) in human retina tissue indirectly leads to
  1.    colour blindness
  2.    blindness
  3.    pressure builds up
  4.    all of these
Explanation:-
Answer: Option B. -> blindness
Question 10. Each cycle of β-oxidation produces
  1.    1 FAD, 1 NAD+ and 2 CO2 molecules
  2.    1 FADH2, 1 NADH and 1 acetyl-CoA
  3.    1 FADH2, 1 NAD+, and 1 acetyl-CoA
  4.    1 FADH2, 1 NADH and 2 CO2 molecules
Explanation:-
Answer: Option B. -> 1 FADH2, 1 NADH and 1 acetyl-CoA
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