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. Oxidation
- B. Reduction
- C. Redox
- D. None of the above options is correct
Explanation: Cellular respiration is a redox reaction, i.e., both oxidation & reduction occurs.
Correct answer: Redox- A. ATP is hydrolyzed and NADP is reduced
- B. ATP is hydrolyzed and NADPH is oxidized
- C. ATP is synthesized and NADP is reduced
- D. ATP is synthesized and NADPH is oxidized
Explanation: "The explanation for this question will be added soon!".
Correct answer: ATP is synthesized and NADP is reduced- A. Grana
- B. Stroma
- C. Thylakoid
- D. Intergrana
Explanation: Option A: Grana: Stacks of thylakoids within the chloroplast responsible for the light-dependent reactions of photosynthesis.
Correct answer: Stroma- A. Light dependent reaction
- B. Light independent reaction
- C. Both of these options are correct
- D. None of the above options are correct
Explanation: The Calvin cycle takes place in the stroma and uses the ATP and NADPH from the light-dependent reactions to fix carbon dioxide, producing…
Correct answer: Light independent reaction- A. Hydrogen sulphide
- B. Carbon dioide
- C. Water
- D. Hydrogen peroxide
Explanation: In photosynthesis, photosystem II loses its electrons when excited by photons.
Correct answer: Water- A. Glycolysis
- B. Ribulose Bisphosphate
- C. Glyceraldehyde 6-phosphate
- D. NADH
Explanation: In the oxidative phase, each molecule of glyceraldehyde 3-phosphate (produced earlier in the preparatory phase) undergoes dehydrogenation.
Correct answer: Glyceraldehyde 6-phosphate- A. Cytochrome A
- B. Oxygen
- C. Cytochrome a3
- D. Cytochrome C
Explanation: The final acceptor of electrons in the respiratory chain is oxygen (O2).
Correct answer: Oxygen- A. Chlorophyll a and b have same absorption spectra.
- B. Chlorophyll a and b have different absorption spectra.
- C. Chlorophyll a and carotenoids have same absorption spectra.
- D. Carotenoids and chlorophyll b have same absorption spectra.
Explanation: Yes, chlorophyll-a and chlorophyll-b, the two main types of chlorophyll found in photosynthetic organisms, have slightly different…
Correct answer: Chlorophyll a and b have different absorption spectra.- A. Calvin Cycle
- B. Bundle Sheath cells
- C. Pepco
- D. CO2 Fixation in Mesophyll
Explanation: CO2 fixation does occur in the mesophyll cells of C4 plants, but it follows a different pathway compared to C3 plants.
Correct answer: CO2 Fixation in Mesophyll- A. I only
- B. II only
- C. I and II only
- D. II and III only
- E. I, II and III only
Explanation: ATP is produced during photosynthesis as well as aerobic and anaerobic respiration.
Correct answer: I, II and III only- A. Photosystem I
- B. Non cyclic photophosphorylation
- C. Photosystem II
- D. Cyclic photophosphorylation
Explanation: "The explanation for this question will be added soon!".
Correct answer: Non cyclic photophosphorylation1252. Cu is present in
- A. Plasmalemma
- B. Plastoquinone
- C. Ferredoxin
- D. Plastocyanin
Explanation: "The explanation for this question will be added soon!"
Correct answer: Plastocyanin1253. When a molecule of pyruvic acid is subjected to anaerobic oxidation and forms lactic acid, there is
- A. Gain of 2 ATP molecules
- B. Loss of 3 ATP molecules
- C. Loss of 6 ATP molecules
- D. Gain of 3 ATP molecules
Explanation: "The explanation for this question will be added soon!"
Correct answer: Loss of 6 ATP molecules1254. Fermentation is
- A. Incomplete oxidation of proteins
- B. Complete oxidation of carbohydrates
- C. Aerobic respiration
- D. Incomplete oxidation of carbohydrates
Explanation: ]Fermentation is incomplete oxidation of carbohydrates.
Correct answer: Incomplete oxidation of carbohydrates- A. Glycolysis
- B. Pyruvic acid oxidation
- C. Krebs cycle
- D. Electron transport chain
Explanation: Glycolysis is the metabolic pathway that occurs in the cytoplasm of cells and is the first stage of cellular respiration.
Correct answer: Glycolysis- A. C55 H10 O4 N6 Mg
- B. C55 H70 O6 N5 Mg
- C. C55 H71 O6 N4 Mg
- D. C55 H70 O6 N4 Mg
Explanation: C55H70MgN4O6 is the correct formula of chlorophyll b.
Correct answer: C55 H70 O6 N4 Mg- A. Animals
- B. Plants
- C. Both A and B
- D. None of these
Explanation: Cartenoids perform a protective function in both plants and animals. Carotenoids are essential compounds along with chlorophylls in…
Correct answer: Both A and B- A. 20%
- B. 15%
- C. 10%
- D. 1%
Explanation: 50% of the light from the sunlight supports the process of photosynthesis.
Correct answer: 1%- A. T.W.Engleman
- B. Julius von Sachs
- C. Gregor Mendel
- D. Robert Koch
Explanation: The first action spectrum, which shows the relationship between the rate of a biological process (like photosynthesis) and the wavelength…
Correct answer: T.W.Engleman- A. High concemration of NADH
- B. Low concentration of citrate
- C. High concentration of ATP
- D. Pyruvate decarboxylase
Explanation: Phosphofructokinase is a key regulatory enzyme in the glycolysis pathway, and it is inhibited by high concentrations of ATP.
Correct answer: High concentration of ATP