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 occurs in dark
- B. It does not require light energy
- C. It cannot occur during daytime
- D. It occurs more rapidly at night
Explanation: "The explanation for this question will be added soon!".
Correct answer: It does not require light energy- A. 750
- B. 650
- C. 680
- D. 670
Explanation: The chlorophyll, a special pair of the two photosystems, absorb different wavelengths of light.
Correct answer: 680583. Cancer cells require large amounts of ATP, which of the following produce a higher number of ATP?
- A. Electron transport chain
- B. Oxidative phosphorylation
- C. Krebs Cycle
- D. Glycolysis
Explanation: Cancer cells require large amounts of energy in the form of ATP. Which of the following processes results in the greatest production of…
Correct answer: Oxidative phosphorylation- A. Fructose-I ,4-phosphate
- B. Fructose-1,6-bisphosphate
- C. Bisphosphate
- D. Fructose
Explanation: The enzyme phosphofructokinase transforms fructose-6-phosphate to fructose-1,6-diphosphate.
Correct answer: Fructose-1,6-bisphosphate- A. Kreb's cycle
- B. Calvin cycle
- C. Chemiosmosis
- D. Electron transport chain
Explanation: Calvin cycle (also known as the Calvin-Benson cycle or the C3 cycle) is a series of reactions that occur in the chloroplasts of plants…
Correct answer: Calvin cycle- A. 4
- B. 36
- C. 2
- D. 38
Explanation: Anaerobic respiration is a type of respiration that produces energy without using oxygen as the final electron acceptor.In microorganisms…
Correct answer: 2- A. Anabolism
- B. Catabolism
- C. Hydrolysis
- D. All of these
Explanation: Hydrolysis is a chemical process in which a molecule is split into two parts by the addition of a water molecule.
Correct answer: Hydrolysis- A. Cytochrome a
- B. Coenzyme Q
- C. Coenzyme B
- D. Coenzyme A
Explanation: Cytochrome c is oxidized by Cytochrome a.OPTION A: Cytochrome a oxidizes cytochrome C.OPTION B: Coenzyme Q is located in the inner…
Correct answer: Cytochrome a- A. ATP
- B. Carbon dioxide
- C. Water
- D. Both Options A and C are correct
Explanation: OPTION A: The end product of cellular respiration is ATP. OPTION B: CO2 is a gas and has no link with it.
Correct answer: Both Options A and C are correct- A. P680, P700, water, NADP
- B. Water, P700, NADP, P680
- C. P700, P680, NADP, water
- D. Water, P680, P700, NADP
Explanation: In photosynthesis, a light-dependent reaction uses light energy from the sun to split water which has been taken in by the organism.
Correct answer: Water, P680, P700, NADP- A. Coenzyme C
- B. Coenzyme Q
- C. Cytochrome b
- D. Cytochrome a
Explanation: Coenzyme Q is oxidized by Cytochrome b in the electron transport chain (ETC).
Correct answer: Cytochrome b592. ATP is used:
- A. To synthesize the macromolecules
- B. To transport of molecules and ions
- C. To perform mechanical work
- D. All of above
Explanation: ATP is the energy currency of the cell, meaning it can be broken down to release energy when needed by the body.
Correct answer: All of above- A. Reduction in amount of Fe-S centers
- B. Lowered production of water from the electron transport chain that cause dehydration
- C. iron is important for electron transport chain
- D. Iron is important for NADH production
Explanation: Iron and copper are essential nutrients for all living organisms as cofactors of many enzymes and play important roles in electron…
Correct answer: iron is important for electron transport chain- A. Krebs cycle
- B. Calvin Cycle
- C. Galvin cycle
- D. Glycolysis
Explanation: The dark reaction in photosynthesis, where sugars are synthesized, is known as the Calvin Cycle or the light-independent reactions.
Correct answer: Calvin Cycle- A. 10 %
- B. 50 %
- C. 1-2 %
- D. 0.3 to 0.4 %
Explanation: Option C is correct since stomata are the microscopic pores on leaf surfaces that facilitate gas exchange with the atmosphere, namely…
Correct answer: 1-2 %- A. 1
- B. 2
- C. 3
- D. 6
Explanation: Option A is correct since out of every 6 molecules of G3P formed only one molecule leaves the cycle to be used by plants for making…
Correct answer: 1- A. Pyruvic acid
- B. Acetyl CoA
- C. Carbon dioxide
- D. Both Options A and B are correct
Explanation: Pyruvate enters the Krebs cycle after glycolysis in the form of Acetyl CoA.
Correct answer: Acetyl CoA- A. ATP ligase
- B. ATP kinase
- C. ATP synthase
- D. ATP dehydrogenase
Explanation: "The explanation for this question will be added soon!".
Correct answer: ATP synthase- A. Kreb's cycle
- B. Calvin cycle
- C. Chemiosmosis
- D. Electron transport chain (ETC)
Explanation: The Calvin cycle forms glyceraldehyde - 3 - phosphate (G3P) from inorganic carbon dioxide.
Correct answer: Calvin cycle- A. Antenna complex
- B. Reaction center
- C. Photosystem
- D. None of these options are correct
Explanation: Antenna complexes are light-harvesting systems (LHC) which are protein-pigment complexes in photosynthetic membranes.
Correct answer: Antenna complex