Bioenergetics MCQs for MDCAT Practice

Biology section, Bioenergetics chapter. Sample questions from past PMC papers.

1. Question 1
   The final acceptor of electrons during the noncyclic electron pathway is:
   • A.Photosystem I
   • B.Photosystem II
   • C.ATP
   • D.NADP+
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2. Question 2
   The reaction of carbon dioxide and RUBP is catalyzed by
   • A.ATP synthase
   • B.Globulin
   • C.RuBisCO
   • D.NADH dehydrogenase
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3. Question 3
   Which of the following facilitates opening of stomatal aperture?
   • A.Decrease in turgidity of guard cells
   • B.Radial orientation of cellulose microfibrils in the cell wall of guard cells
   • C.Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
   • D.Contraction of outer wall of guard cells
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4. Question 4
   The primary function of ETC is to:
   • A.Synthesize ATP directly
   • B.Reduce NAD⁺
   • C.Control glycolysis
   • D.Release energy in controlled steps
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5. Question 5
   In glycolysis, ultimately:
   • A.protein is converted to glucose
   • B.glucose is converted to fructose
   • C.starch is converted to glucose
   • D.glucose is converted to pyruvic acid
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6. Question 6
   Product of anaerobic respiration in animals is ___________.
   • A.Pyruvic acid
   • B.Lactic acid
   • C.Alcohol
   • D.NADPH-2
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7. Question 7
   Energy released during electron flow is used primarily for:
   • A.Pumping protons into intermembrane space
   • B.Reducing NAD⁺
   • C.Splitting water
   • D.Forming acetyl-CoA
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8. Question 8
   End product of light reaction of photosynthesis is:
   • A.ADP and NADPH
   • B.ATP and NADPH
   • C.Carbon dioxide and water
   • D.NADPH and AMP
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