Free Bioenergetics MCQs with Answers
1,378 Bioenergetics MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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- A. It requires darkness
- B. It does not require light
- C. It requires night period
- D. It cannot proceed in light
Explanation: It is dark reaction which uses the assimilatory power and reducing power synthesized in light reaction in reducing CO2 to synthesize…
Correct answer: It does not require light- A. One molecule of chlorophyll a and primary electron acceptor
- B. Many molecule of chlorophyll a and primary electron acceptor
- C. One or more molecules of chlorophyll a and primary electron acceptor
- D. Chlorophyll a, chlorophyll b and primary electron acceptor
Explanation: Reaction center of photosynthesis lies in chlorophyll a. It consists of one or more molecules of chlorophyll a along with a primary…
Correct answer: One or more molecules of chlorophyll a and primary electron acceptor- A. Primary electron acceptor
- B. Chlorophyll b
- C. Accessory pigments
- D. Carotenoids
Explanation: Chlorophyll a molecules of reaction center and associated proteins are closely linked to the nearby electron transport system.
Correct answer: Primary electron acceptor1064. The splitting up of water molecule into two hydrogen ions and an oxygen atom, by light is called:
- A. Electrolysis of water
- B. Ionization of water
- C. Photolysis of water
- D. Autolysis
Explanation: Photo means light and lysis means splitting up. So splitting up of water by light is called photolysis of water.
Correct answer: Photolysis of water- A. PS → Cytochrome complex → PQ
- B. PQ → PC → Cytochrome complex
- C. Cytochrome complex → PQ → PC
- D. PQ → Cytochrome complex → PC
Explanation: It is photosynthetic electron transport chain involved in non-cyclic phosphorylation.
Correct answer: PQ → Cytochrome complex → PC- A. PQ
- B. PC
- C. Cytochrome complex
- D. Fd
Explanation: Cyclic phosphorylation involves PS-I, primary electron acceptor of PS-I, Fd, cytochrome comple and PC.
Correct answer: PQ- A. ATP
- B. Water
- C. Oxygen
- D. NADH2
Explanation: It occurs through chemiosmosis in cytochrome complex.
Correct answer: ATP- A. NADP → Primary electron acceptor of PS-I → NADP → PS-I
- B. PS-I → Fd → Primary acceptor of PS-I → NADP
- C. PS-I → Primary acceptor of PS-I → NADP → Fd
- D. PS-I → Primary acceptor of PS-I → Fd → NADP
Explanation: It starts from PS-I and ends at formation of reducing power.
Correct answer: PS-I → Primary acceptor of PS-I → Fd → NADP- A. Non-cyclic photophosphorylation
- B. Cyclic electron flow
- C. Z-scheme
- D. Non-cyclic electron flow
Explanation: In cyclic phosphorylation only PS-I is involved.
Correct answer: Cyclic electron flow- A. Oxford university
- B. University of California
- C. Cambridge university
- D. Tubingen university
Explanation: Melvin Calvin and his colleagues at The University of California discovered the details of path of carbon in these reactions.
Correct answer: University of California- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In first stage of reduction phase assimilatory power is utilized and 3PGA is converted into 1,3 BPGA.
Correct answer: Option A- A. Fixation phase of Calvin cycle
- B. Regeneration phase of Calvin cycle
- C. Reduction phase of Calvin cycle
- D. Condensation phase of Calvin cycle
Explanation: The Calvin cycle consists of several phases, including the fixation, reduction, and regeneration phases.
Correct answer: Reduction phase of Calvin cycle- A. Fixation
- B. Regeneration
- C. Reduction
- D. Reduction and Regeneration
Explanation: Only 3ATPs are used to regenerate 3RuBP from 5 G.3.P.
Correct answer: Regeneration- A. 3, 6, 9
- B. 6, 12, 18
- C. 12, 24, 36
- D. 24, 48, 72
Explanation: As synthesis of glucose requires 6, 12, 18 molecules of CO2, NADPH and ATPs respectively, maltose consists of two glucose molecules.
Correct answer: 12, 24, 36- A. 1, 2, 3
- B. 3, 6, 9
- C. 6, 12, 18
- D. 12, 24, 36
Explanation: Ratio of input of Calvin Cycle will remain same.
Correct answer: 1, 2, 3- A. Oxidation of pyruvate
- B. Glycolysis
- C. Kreb's cycle
- D. TCA cycle
Explanation: It indicates formation of two molecules of pyruvate from one molecule of glucose.
Correct answer: Glycolysis- A. Oxidation of pyruvate
- B. Glycolysis
- C. Kreb's cycle
- D. TCA cycle
Explanation: Glycolysis is such a process which is found in both prokaryotes and eukaryotes. It occurs in cytoplasm.
Correct answer: Glycolysis- A. Oxidation of pyruvate
- B. Citric acid cycle
- C. Glycolysis
- D. Oxidative phosphorylation
Explanation: If aerobic conditions prevail after glycolysis it will follow the path of oxidation of pyruvate and Kreb's cycle otherwise it will follow…
Correct answer: Glycolysis- A. Pyruvate in the cell
- B. Glucose in the cell
- C. Acetate in the cell
- D. Organic food in cell
Explanation: After glycolysis cell gets two molecules of pyruvate. After formation of pyruvate there comes oxidation of pyruvate and Krebs cycle, if…
Correct answer: Pyruvate in the cell- A. Fermentation
- B. Oxidative phosphorylation
- C. Respiratory chain
- D. Krebs cycle
Explanation: Fermentation is an anaerobic process which is also called as anaerobic respiration.
Correct answer: Fermentation