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. Thylakoid
- B. Grana
- C. Stroma
- D. All of these options are correct
Explanation: The dark reactions of photosynthesis occur in the stroma of the chloroplast where they utilize the products of the light reaction.
Correct answer: Stroma602. How many ATP molecules are made from one molecule of glucose during anaerobic cellular respiration?
- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Without oxygen, organisms must use anaerobic respiration to produce ATP, and this process produces only two molecules of ATP per molecule…
Correct answer: 2- A. Aerobic respiration
- B. Photosynthesis
- C. None of these
- D. Anaerobic respiration
Explanation: C6H12O6 + 6O2 → 6CO2 + 6H2O + energy is the equation of aerobic respiration.
Correct answer: Aerobic respiration- A. 6
- B. 3
- C. 8
- D. 18
Explanation: During the Krebs cycle, which is also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, one molecule of glucose results in…
Correct answer: 6- A. Fumarate to Malate
- B. Succinate to Fumarate
- C. Malate to Oxaloacetate
- D. α-Ketoglutarate to Succinate
Explanation: One molecule of FADH2 is produced in the Krebs cycle during the conversion of succinate to fumarate.
Correct answer: Succinate to Fumarate- A. Malate
- B. Citrate
- C. Malonic acid
- D. Fumarate
Explanation: D is correct. It is an important step of Kreb's cycle as succinate dehydrogenase converts succinate into fumurate.
Correct answer: Fumarate- A. All Types of Cells
- B. All Anaerobic Cells
- C. All Primitive Cells
- D. All Aerobic Cells
Explanation: Oxidative phosphorylation, which involves the synthesis of ATP in the presence of oxygen, occurs in aerobic cells.
Correct answer: All Aerobic Cells- A. Alpha Ketoglutaric Acid
- B. Citric Acid
- C. Glyceric Acid
- D. Acetic Acid
Explanation: The statement you've provided is partially correct. Before entering the Krebs (citric acid) cycle, each pyruvate molecule, which is a…
Correct answer: Acetic Acid- A. Glucose
- B. Sucrose
- C. Fructose
- D. Insulin
Explanation: The most common respiratory substrate (a substance that undergoes oxidation in cellular respiration to produce energy) is glucose.
Correct answer: Glucose- A. Phytol
- B. Porphyrin ring
- C. Pyrrole
- D. Thylakoid membrane
Explanation: The part of the chlorophyll molecule that absorbs light is the porphyrin ring, which is a complex cyclic structure containing a centrally…
Correct answer: Porphyrin ring- A. Lyases
- B. Ligases
- C. Hydrolases
- D. None
Explanation: Phosphatases belong to the group of enzymes known as hydrolases. Specifically, they are a type of hydrolase called phosphohydrolases.
Correct answer: Hydrolases- A. Bacteria
- B. Algae
- C. Protonema
- D. Cyanobacteria
Explanation: Using evidence from bacteria that utilize hydrogen sulfide (H2S) for photosynthesis, van Niel hypothesized that all photosynthetic…
Correct answer: Bacteria- A. Thylakoids
- B. Grana
- C. Stroma
- D. Cytoplasm
Explanation: Some bacteria are photosynthetic but they lack chloroplast. Their photosynthetic pigments are present in cytoplasm of cell.
Correct answer: Cytoplasm- A. Only during the day
- B. Only at day
- C. During both day and night
- D. Only when photosynthesis is going on
- E. Only when photosynthesis is not going on
Explanation: Respiration occurs all through the day, but the photosynthesis process occurs in the daytime, in the presence of sunlight only.
Correct answer: During both day and night- A. I -> II -> III
- B. I -> III -> II
- C. II -> I -> III
- D. II -> III -> I
- E. III -> I -> II
Explanation: This energy comes from the food we eat. Our bodies digest the food we eat by mixing it with fluids (acids and enzymes) in the stomach.
Correct answer: II -> I -> III- A. 3-phosphoglycerate
- B. 1. 3 biphosphoglycerate
- C. Glyceraldehyde - 3 phosphate
- D. Ribulose - 5 - phosphate
Explanation: 3-phosphoglycerate (3-PG) is an important intermediate compound in the Calvin cycle, which is a series of biochemical reactions that occur…
Correct answer: 3-phosphoglycerate- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Pyruvate enters and ATP leaves a mitochondrion during aerobic respiration.
Correct answer: Option D- A. PS I
- B. PS II
- C. ATP
- D. NADP+
Explanation: "The explanation for this question will be added soon!".plants, the final electron acceptor in noncyclic electron flow is (a) NADP+.
Correct answer: NADP+- A. Citric acid cycle
- B. Krebs cycle
- C. Dark reaction
- D. Light reaction
Explanation: "The explanation for this question will be added soon!"
Correct answer: Citric acid cycle- A. Light dependent reaction
- B. Light independent reaction
- C. Both of these
- D. None of above
Explanation: "The explanation for this question will be added soon!".
Correct answer: Light independent reaction