Biochemistry Questions and Answers – ATP Synthesis by Photophosphorylation

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “ATP Synthesis by Photophosphorylation”.

1. If 8 photons are required to produce one molecule of O₂, how many photons are required to produce one molecule of glucose?
a) 6
b) 8
c) 48
d) 12
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2. When compared to retinal, chlorophyll can be described as a pigment that has a ____________
a) Narrow absorption range but high efficiency
b) Narrow absorption range but low efficiency
c) Wide absorption range but high efficiency
d) Wide absorption range but low efficiency
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3. Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?
a) P₇₀₀, P₆₈₀, NADP⁺, water
b) P₆₈₀, water, P₇₀₀, NADP⁺
c) Water, P₇₀₀, NADP⁺, P₆₈₀
d) Water, P₆₈₀, P₇₀₀, NADP⁺
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4. Which pigment is used in human vision?
a) Retinal
b) Vitamin A
c) Ferredoxin
d) Beta-carotene
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5. Why light is required for light dependent reactions?
a) It splits ATP molecules which generates the energy necessary to power the light independent reactions
b) It is the source for electrons
c) It splits the water molecules
d) It energizes electrons in the reaction center
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6. Photosynthesis takes place in sac like membranes called ___________
a) Thylakoids
b) Grana
c) Photosystems
d) Photons
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7. The carbon-assimilation reactions require ATP and NADPH in the ratio ___________
a) 3:2
b) 2:3
c) 3:4
d) 4:3
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8. Which of the following systems has an associated water splitting activity resembling that of plants?
a) Photosystem
b) Photosystem I
c) Photosystem II
d) Photosystem III
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9. The earliest photo synthesizers used which of the following as the source of hydrogen?
a) CO₂
b) C₆H₁₂O₆
c) H₂O
d) H₂S
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10. Photosystem I used which of the following in its photo-center?
a) P700
b) P800
c) P900
d) P600
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Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.