Biochemistry Questions and Answers – General Features of Photophosphorylation

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “General Features of Photophosphorylation”.

1. Which of the following statements about thylakoids is false?
a) They contain chlorophyll pigments
b) They contain the photosystems
c) They contain Calvin cycle enzymes
d) They contain the electron transport machinery
View Answer

Answer: c
Explanation: Chloroplast stroma contains Calvin cycle enzymes and intermediates.

2. Which one of the following is the source of electrons in photosynthesis?
a) Carbohydrates
b) CO2
c) Water
View Answer

Answer: c
Explanation: Water is the source of electrons in photosynthesis. These electrons are required to reduce oxidized chlorophyll a molecules.

3. Which of the following about Calvin cycle is correct?
a) It is a metabolic pathway by which plants convert CO2 into pentose sugars as the main product
b) With decrease in light intensity, the enzymes are more reactive
c) Rubisco adds CO2 to 3-phosphoglycerate
d) It is a metabolic pathway by which plants convert CO2 and water into carbohydrates
View Answer

Answer: d
Explanation: CO2 combines with ribulose 1, 5-bisphosphate.
The enzymes are more reactive if there is an increase in light intensity.

4. What are the favorable conditions for cyclic photophosphorylation?
a) Aerobic and optimum light
b) Aerobic condition only
c) Aerobic and low light intensity
d) Anaerobic and low light intensity
View Answer

Answer: a
Explanation: Favorable conditions for cyclic photophosphorylation are aerobic and optimum light.

5. Hydrogen is transferred from the light reaction to the dark reaction in photosynthesis by _____________
a) DPN
b) NAD
c) ATP
View Answer

Answer: a
Explanation: Diphosphopyridine nucleotide transfers hydrogen from the light reaction to the dark reaction in photosynthesis.
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6. Calvin cycle occurs in ____________
a) Cytoplasm
b) Chloroplast
c) Mitochondria
d) Golgi body
View Answer

Answer: a
Explanation: Calvin cycle occurs in cytoplasm.

7. Light energy is converted to chemical energy in the presence of ____________
a) Chloroplast
b) Ribosomes
c) Mitochondria
d) Stomata
View Answer

Answer: a
Explanation: Photosynthetic pigment chlorophyll captures the energy from sunlight and converts it and stores it in energy-storage molecules ATP and NADPH.

8. Photosynthesis can be described as ____________
a) Reductive, anabolic, endergonic process
b) Reductive, anabolic, exergonic process
c) Oxidative, anabolic, endergonic process
d) Oxidative, catabolic, exergonic process
View Answer

Answer: a
Explanation: Photosynthesis involves gaining of electrons; producing complex substances from simpler ones and requires energy.

9. Who is the first person to study the influence of light during photosynthesis?
a) Blackmann
b) Van Niel
c) J. Ingenhouz
d) Warburg
View Answer

Answer: c
Explanation: Jan Ingenhouz was the best known to show that light is essential for photosynthesis.

10. The percentage of light energy fixed in photosynthesis is around ____________
a) 100%
b) 10%
c) 1%
d) 0.1%
View Answer

Answer: c
Explanation: Around 1% of light energy is fixed in photosynthesis.

Sanfoundry Global Education & Learning Series – Biochemistry.

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

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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