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. Red light
- B. Green light
- C. Blue light
- D. Violet
Explanation: As green light wavelength is least effective in photosynthesis.
Correct answer: Green light- A. ADP
- B. ATP
- C. GTP
- D. ATP and NADPH2
Explanation: This option is incorrect, as during cyclic photophosphorylation, energy molecules are obtained in the form of ATP.
Correct answer: ATP- A. Photosynthetic enzyme
- B. Carbohydrates present in leaf
- C. Water
- D. Carbon dioxide
Explanation: "The explanation for this question will be added soon!".
Correct answer: Water- A. In the stroma of chloroplast
- B. Present in the outer membrane of chloroplast
- C. Present in mitochondria
- D. Bound to the thylakoid
Explanation: "The explanation for this question will be added soon!".
Correct answer: Bound to the thylakoid1325. Respiration in plants:
- A. Often requires carbon dioxide
- B. Is characteristic of all living cells
- C. Occurs only during day
- D. Results in the formation of amino acid
Explanation: Respiration in plants occurs in all living cells and is, therefore, characteristic of all living cells so option A) is correct.
Correct answer: Is characteristic of all living cells- A. 34 molecules of ADP into 34 molecules of ATP
- B. 30 molecules of ADP into 30 molecules of ATP
- C. 38 molecules of ADP into 38 molecules of ATP
- D. 32 molecules of ADP into 32 molecules of ATP
Explanation: Option A: 34 ADP into 34 ATP. This is incorrect because the actual yield of ATP from the oxidation of one glucose molecule is less than…
Correct answer: 38 molecules of ADP into 38 molecules of ATP- A. Starch and O2
- B. H2O and energy
- C. CO2, H2O and energy
- D. Sugar and O2
Explanation: "The explanation for this question will be added soon!"
Correct answer: CO2, H2O and energy- A. Ethanol and water
- B. Water and carbon dioxide
- C. Methanol and CO2
- D. Ethanol and carbon dioxide
Explanation: "The explanation for this question will be added soon!"
Correct answer: Ethanol and carbon dioxide- A. It produces a net gain of NADH
- B. It produces a net gain of ATP
- C. It is an aerobic process
- D. It produces more energy per glucose molecule than aerobic respiration
Explanation: "The explanation for this question will be added soon!"
Correct answer: It produces a net gain of NADH- A. All 36 ATP molecules inside the mitochondria
- B. 2 ATP molecules during glycolysis and 34 ATP during the Krebs cycle
- C. 2 ATP molecules during glycolysis and 34 ATP during respiratory chain
- D. 2 ATP molecules outside the mitochondria and 34 ATP molecules inside the mitochondria
Explanation: "The explanation for this question will be added soon!"
Correct answer: 2 ATP molecules outside the mitochondria and 34 ATP molecules inside the mitochondria- A. NADPH2
- B. NADH2
- C. FADH2
- D. FAD
Explanation: "The explanation for this question will be added soon!"
Correct answer: NADH2- A. Symbiosis
- B. Chemiosmosis
- C. Both A and B
- D. None of these
Explanation: "The explanation for this question will be added soon!"Chemiosmosis is a process in which ions move across a semi-permeable membrane and…
Correct answer: Chemiosmosis- A. ATP
- B. Carbon dioxide
- C. Water
- D. Both A and C
Explanation: "The explanation for this question will be added soon!"This is the correct answer as both ATP and water are the end products of the ETC in…
Correct answer: Both A and C- A. Coenzyme c
- B. Coenzyme d
- C. Coenzyme b
- D. Coenzyme a
Explanation: "The explanation for this question will be added soon!"
Correct answer: Coenzyme b- A. Cyt. b
- B. Cyt. c
- C. Cyt. a3
- D. Cyt. a1
Explanation: The terminal carrier of the cytochrome complex is specifically cytochrome a3 (Cyt A3).
Correct answer: Cyt. a3- A. Glycolysis
- B. The oxidation of pyruvates
- C. Krebs cycle
- D. All of these
Explanation: FADH2 is indeed produced during the Krebs cycle, which is also known as the citric acid cycle or TCA (tricarboxylic acid cycle).
Correct answer: Krebs cycle- A. Fructose-I, 4-phosphate
- B. Fructose-1,6-bisphosphate
- C. Bisphosphate
- D. Fructose
Explanation: Phosphofructokinase (PFK) is an enzyme that catalyzes an important regulatory step in glycolysis.
Correct answer: Fructose-1,6-bisphosphate- A. CO2 and H2O
- B. CO2, H2O and ATP
- C. C6HI2O6 and H2O
- D. None
Explanation: The respiratory activity that occurs in green cells in the presence of light resulting in the release of carbon dioxide is termed…
Correct answer: CO2 and H2O- A. Light-dependent reaction
- B. Light-independent reaction
- C. Both of these
- D. None of the above
Explanation: The dark reactions take place in the stroma of chloroplast. These reactions do not require light directly and can occur in the presence or…
Correct answer: Light-independent reaction- A. Calvin cycle
- B. Photosystem I
- C. Photosystem II
- D. The light reaction
Explanation: The cyclic series of reactions, catalyzed by respective enzymes, by which the carbon is fixed and reduced resulting in the synthesis of…
Correct answer: Calvin cycle