Free Cellular Respiration MCQs with Answers
182 Cellular Respiration 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 releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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182 questions · page 8 of 10
- A. Nucleus
- B. Cytoplasm
- C. Mitochondria
- D. Chloroplast
Explanation: β-Oxidation is a process that occurs in the mitochondria.It involves the breakdown of fatty acids into acetyl-CoA, which enters the citric…
Correct answer: Mitochondria- A. Isocitric acid → Oxalosuccinic acid → α-Ketoglutaric acid
- B. Oxalosuccinic acid → Isocitric acid → α-Ketoglutaric acid
- C. α-Ketoglutaric acid → Isocitric acid → Oxalosuccinic acid
- D. Isocitric acid → α-Ketoglutaric acid → Succinic acid
Explanation: The correct sequence in the Krebs cycle is: Isocitric acid → α-Ketoglutaric acid → Succinic acid.
Correct answer: Isocitric acid → α-Ketoglutaric acid → Succinic acid- A. Light absorption
- B. Consumption of carbon dioxide
- C. Light emission
- D. Both A and B
Explanation: An action spectrum typically illustrates the relative effectiveness of different wavelengths of light in driving a specific biological…
Correct answer: Consumption of carbon dioxide- A. Presence of enzyme in high concentration
- B. Absence of Rubisco
- C. PEP carboxylase being strictly carboxylase
- D. High yield of enzyme
Explanation: PEP carboxylase is an enzyme that plays a crucial role in the C4 photosynthetic pathway.
Correct answer: PEP carboxylase being strictly carboxylase- A. Glucose
- B. Pyruvate
- C. Acetyl CoA
- D. CO2
Explanation: Glycolysis converts glucose to 2 pyruvate molecules, with net gain of 2 ATP and 2 NADH.
Correct answer: Pyruvate- 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 oxidases158. 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 acids160. 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: Fermentation