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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Read the Bioenergetics notesFree MDCAT chapter notes with key terms1,378 questions · page 16 of 69
- A. It provides the hydrogen nuclei needed to create a proton gradient in the intermembrane space
- B. It is important in creating oxaloacetic acid in the Krebs cycle
- C. It is needed for glycolysis, which begins the process of respiration in cells
- D. It is the final electron acceptor in the electron transport chain
Explanation: The final electron acceptor in cellular respiration is atmospheric oxygen.
Correct answer: It is the final electron acceptor in the electron transport chain- A. 8
- B. 2
- C. 3
- D. 4
Explanation: Pyruvic acid has the molecular formula C3H4O3. It has 3 carbon atoms.you can remember it by keeping in mind the fact that one glucose…
Correct answer: 3- A. Pepsin
- B. Rubisco
- C. Isomerase
- D. Peptide
Explanation: Rubisco is the enzyme that catalyzes the fixation of Carbon dioxide in Ribulose Bisphosphate in the Calvin Benson cycle also known as the…
Correct answer: Rubisco- A. Alcoholic fermentation
- B. Aerobic respiration
- C. Lactic fermentation
- D. Anaerobic respiration
Explanation: Aerobic respiration takes place in the presence of oxygen and results in the complete oxidation of glucose.
Correct answer: Aerobic respiration- A. Mitochondria
- B. Golgi bodies
- C. Chloroplast
- D. Cytoplasm
Explanation: The enzymes for glycolysis are present in the cytoplasm so the process occurs in the cytoplasm.
Correct answer: Cytoplasm- A. Grana
- B. Stroma
- C. Frets
- D. Thylakoid
Explanation: The dark or light-independent reaction of photosynthesis occurs in the stroma of the chloroplasts and utilizes carbon dioxide, adenosine…
Correct answer: Stroma- A. 30
- B. 36
- C. 38
- D. 40
Explanation: In aerobic respiration, there are two types of phosphorylation: oxidative and substrate-level phosphorylation.
Correct answer: 36- A. Chromosome
- B. ATP
- C. DNA
- D. Enzyme
Explanation: ATP is the energy currency of the cell as it can be used to transfer energy from one reaction to another.
Correct answer: ATP- A. ATP is a co-enzyme
- B. ATP is an enzyme
- C. ATP is a prosthetic part of an enzyme
- D. ATP is an organic ion
Explanation: Coenzymes are organic detachable cofactors that are derived from vitamins.ATP, NAD+, and FAD+ are a few examples of coenzyme.
Correct answer: ATP is a co-enzyme- A. H₂O --> NADPH --> Calvin cycle
- B. None of these
- C. H₂O --> O₂ --> NADPH
- D. H₂O --> PS-I --> PS-II
Explanation: 'H₂O --> NADPH --> Calvin cycle' is the correct option as water is first split to form oxygen, hydrogen ions, and electrons.
Correct answer: H₂O --> NADPH --> Calvin cycle- A. Citric acid
- B. Oxaloacetate
- C. Succinate
- D. Acetyl CoA
Explanation: Acetyl CoA is the link between glycolysis and Kreb's cycle. Acetyl CoA is formed after decarboxylation of pyruvate.
Correct answer: Acetyl CoA- A. Cell membrane
- B. Nucleus
- C. Cytoplasm
- D. Mitochondria
Explanation: The electron transport chain (ETC) takes place in the mitochondria. More specifically, it occurs in the inner membrane of the mitochondria
Correct answer: Mitochondria- A. 1
- B. 2
- C. 4
- D. 3
Explanation: In the electron transport chain, electron carriers take electrons from NADH and FADH2 and pass them through a chain of complexes.
Correct answer: 3314. Cancer cells require large amounts of ATP. Which of the following produces a high number of ATP?
- A. Glycolysis
- B. Krebs cycle
- C. Oxidative Phosphorylation
- D. Electron transport chain
Explanation: Oxidative phosphorylation is the final stage of cellular respiration and takes place in the inner mitochondrial membrane.
Correct answer: Oxidative Phosphorylation- A. Nucleus
- B. Cytosol
- C. Mitochondria
- D. Ribosomes
Explanation: Glycolysis is the first step in the process of cellular respiration and occurs in the cytosol of the cell.
Correct answer: Cytosol- A. 2
- B. 4.5
- C. 5.6
- D. 7.7
Explanation: In Anaerobic respiration only 2% of the energy present within the chemical bond of glucose is converted into ATP.
Correct answer: 2- A. Symbiosis
- B. Chemiosmosis
- C. Both of these
- D. None of these
Explanation: Chemiosmosis is the movement of protons down an electrochemical gradient created by a partially permeable membrane via ATP synthase…
Correct answer: Chemiosmosis- A. Red blue
- B. Yellow orange
- C. Violet red
- D. Orange red
- E. Both C and D
Explanation: Chlorophyll mainly absorbs light in the violet-blue and orange-red wavelengths, which are crucial for the process of photosynthesis.
Correct answer: Both C and D- A. Fe3+
- B. Mn2+
- C. Co2+
- D. Mg2+
Explanation: "Mg2+" is an inorganic cofactor used in glycolysis to convert glucose into glucose 6-phosphate.
Correct answer: Mg2+- A. ATP
- B. ADP
- C. NADH
- D. Acetyl CoA
Explanation: The correct answer is Acetyl CoA. Acetyl CoA is generated from pyruvate during glycolysis and enters the mitochondrial matrix, where it…
Correct answer: Acetyl CoA