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. 1
- B. 2
- C. 3
- D. 4
Explanation: "The explanation for this question will be added soon!".
Correct answer: 1- A. ATP
- B. DNA
- C. RNA
- D. ADP
Explanation: ATP is called the cell's energy currency because energy released from cellular reactions is temporarily stored in its phosphate bonds and…
Correct answer: ATP- A. 1
- B. 3
- C. 4
- D. 5
Explanation: In the Calvin cycle, six molecules of Glyceraldehyde 3-phosphate (G3P) are produced.
Correct answer: 1- A. The formation of carbon dioxide
- B. The oxidation of cytochrome
- C. The reduction of oxygen to water
- D. The synthesis of ATP
Explanation: c) The reduction of oxygen to water:The reduction of oxygen to water is the final reaction in aerobic respiration.
Correct answer: The reduction of oxygen to water- A. 2
- B. 4
- C. 8
- D. 10
- E. 7
Explanation: Explanation for this question will be added soon.
Correct answer: 2- A. Lactic acid
- B. Ethyl alcohol
- C. Carbon dioxide and water
- D. Acetyl CoA
- E. Both C and D
Explanation: Explanation for this question will be added soon.
Correct answer: Both C and D- A. ATP
- B. GTP
- C. NADPH2
- D. FADH2
- E. NAD
Explanation: Explanation for this question will be added soon.
Correct answer: FADH2- A. 4 carboxylic compounds are produced
- B. 3 carboxylic compounds are produced
- C. Citric acid contain 4 carboxyl groups
- D. Citric acid contain 3 carboxyl groups
- E. None of above
Explanation: Explanation for this question will be added soon.
Correct answer: Citric acid contain 3 carboxyl groups- A. 2 ATP
- B. 3 ATP
- C. 4 ATP
- D. 5 ATP
Explanation: During cellular respiration, NADH (nicotinamide adenine dinucleotide) is an important electron carrier that plays a key role in generating…
Correct answer: 3 ATP- A. When Isocitrate is converted into alpha - ketoglutarate
- B. When alpha - Ketogluterate is converted into Succinate
- C. When Succinate is converted into Fumarate
- D. When Fumarate is converted into Maltose
Explanation: Succinate converts into fumarate using the enzyme succinate dehydrogenase and [FAD] is reduced to [FADH2] which is a prosthetic group of…
Correct answer: When Succinate is converted into Fumarate- A. 1 ATP
- B. 2 ATP
- C. 3 ATP
- D. 4 ATP
Explanation: The oxidation of one molecule of NADH thus leads to the synthesis of three molecules of ATP, whereas the oxidation of FADH2, which enters…
Correct answer: 3 ATP- A. 2 ATP
- B. 3 ATP
- C. 4 ATP
- D. 6 ATP
Explanation: NADH can produce 3 ATP molecules. FADH can produce 2 ATP molecules.
Correct answer: 3 ATP- A. Cytochrome oxidases
- B. Dehydrogenases
- C. Hydrolases
- D. Nucleases
Explanation: Cyanide poisons the mitochondrial electron transport chain within cells and renders the body unable to derive energy (adenosine…
Correct answer: Cytochrome oxidases1354. If oxygen is available, the complete breakdown of glucose produces _ ATP molecules in proka,yotos.
- A. 201
- B. 36
- C. 38
- D. 40
Explanation: A total 38 ATP molecules (2 ATP molecules from glycolysis, 2 from Krebs cycle and 34 from electron transport system) are produced per…
Correct answer: 38- A. Fatty acids, Polysaccharides
- B. Protein, Amino acids
- C. Lipids, Glucose
- D. None of these options are correct
Explanation: CATABOLISM: It is the breakdown of complex molecules in living organisms to form simpler ones, together with the release of energy…
Correct answer: Protein, Amino acids1356. The biochemical process used in the synthesis of alcohol in the presence of yeast is called as _ ?
- A. Respiration
- B. Photosynthesis
- C. Fermentation
- D. Aerobic respiration
Explanation: Fermentation is a process of central metabolism in which an organism converts a carbohydrate, such as starch or sugar, into an alcohol or…
Correct answer: Fermentation1357. Respiration involves the
- A. Chemical process
- B. Biochemical process
- C. Mechanical process
- D. Both B and C
Explanation: Respiration is a biochemical process, in which the cells of an organism obtain energy by reacting oxygen with glucose, resulting in the…
Correct answer: Biochemical process- A. 4.5
- B. 5.5
- C. 7.5
- D. 6.7
Explanation: Because in anaerobic reaction only glycolysis takes placse in which glucose is given 2 ATP and then at the end pyruvate is formed with 4…
Correct answer: 5.51359. One of the most important molecule found in living organisms is ATP. What is its major function?
- A. Energy source of the cell
- B. Coenzyme
- C. Cofactor
- D. Both Options A and B are correct
Explanation: ATP (adenosine triphosphate) is a molecule that serves as the primary energy source for most cellular processes.
Correct answer: Both Options A and B are correct- A. Glycolysis.
- B. ETC.
- C. Krebs cycle.
- D. Calvin cycle.
Explanation: Krebs cycle (or citric acid cycle) breaks down the pyruvic acid to carbon dioxide.
Correct answer: Krebs cycle.