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. 1896
- B. 1897
- C. 1898
- D. 1899
Explanation: Giovanni Battista Grassi's work helped establish that malaria parasites develop in and are transmitted by mosquitoes, with the key…
Correct answer: 1898- A. cytosol
- B. Mitochondria
- C. Matrix
- D. Endoplasmic reticulum
Explanation: Glycolysis takes place in the cytosol, the fluid portion of the cell outside the mitochondria, and splits one glucose molecule into two…
Correct answer: cytosol- A. Anaerobic respiration
- B. Aerobic respiration
- C. Nitrogenous respiration
- D. Acidic respiration
Explanation: Aerobic respiration uses oxygen as the final electron acceptor and generally releases much more ATP than anaerobic respiration.
Correct answer: Aerobic respiration- A. Wind
- B. Carbon
- C. Oxygen
- D. Energy
Explanation: Energy flows through an ecosystem and is progressively lost as heat, so it must continually enter, mainly as sunlight, rather than being…
Correct answer: Energy- A. 2
- B. 4
- C. 6
- D. 36Health
Explanation: Fermentation follows glycolysis, and glycolysis produces 4 ATP but uses 2 ATP, giving a net gain of 4 - 2 = 2 ATP per glucose molecule.
Correct answer: 2- A. Molecular oxygen
- B. NADP+
- C. water
- D. Sulfate
Explanation: In anaerobic respiration, an inorganic substance other than oxygen accepts electrons at the end of the electron transport chain; sulfate…
Correct answer: Sulfate- A. Cytoplasm
- B. Nucleus
- C. Mitochondria
- D. None of the above
Explanation: Fermentation is anaerobic breakdown of glucose and occurs in the cytoplasm, where glycolysis takes place; it does not require…
Correct answer: Cytoplasm- A. Genetic engineering
- B. Biotechnology
- C. Biochemistry
- D. Chemistry
Explanation: Biochemistry applies chemistry to biological processes, including the enzyme-controlled reactions of photosynthesis and respiration and…
Correct answer: Biochemistry- A. C4 plants
- B. C3 plants
- C. C2 plants
- D. CAM plants
Explanation: Kranz anatomy is characteristic of C4 plants, whose leaves have prominent bundle-sheath cells surrounding the vascular bundles.
Correct answer: C4 plants- A. polysaccharides
- B. Polypeptides
- C. Glucose
- D. Sugar
Explanation: Glucose is the usual respiratory substrate because its oxidation in cellular respiration releases energy that is captured as ATP.
Correct answer: Glucose- A. respiration
- B. photorespiration
- C. glycolysis
- D. pyruvic acid
Explanation: Glycolysis is the metabolic pathway in which one glucose molecule is split into two three-carbon molecules of pyruvate.
Correct answer: glycolysis- A. Photosynthesis
- B. Respiration
- C. Photophosporylation
- D. None of these
Explanation: Active transport requires ATP to move substances against their concentration or electrochemical gradients, and plant cells mainly obtain…
Correct answer: Respiration- A. Photorespiration
- B. Calvin cycle
- C. Both of these
- D. None of these
Explanation: The Calvin cycle fixes carbon dioxide into organic compounds that can be used to form sugars and other substances needed for plant growth.
Correct answer: Calvin cycle- A. Glyoxisomes
- B. Peroxisomes
- C. Lysosomes
- D. Mitochondria
Explanation: Glycolate formed during photorespiration diffuses into peroxisomes, where it is oxidized and converted into compounds that continue the…
Correct answer: Peroxisomes- A. Cellular
- B. Organismic
- C. Both of these
- D. None of these
Explanation: Cellular respiration is the series of reactions in cells that uses oxygen in aerobic conditions and releases carbon dioxide while…
Correct answer: Cellular- A. Organismic
- B. Cellular
- C. Both of these
- D. None of these
Explanation: Cellular respiration directly produces ATP by oxidizing glucose and other respiratory substrates, and ATP supplies usable energy for…
Correct answer: Cellular- A. 6.1
- B. 6.3
- C. 7.1
- D. 7.3
Explanation: Hydrolysis of ATP's terminal phosphate releases about 7.3 kcal per mole of ATP under standard biochemical conditions.
Correct answer: 7.3- A. Glycolysis
- B. Kreb's cycle
- C. Light dependent phase
- D. none of these
Explanation: ATP is consumed during the investment phase of glycolysis, where 2 ATP per glucose are used to phosphorylate intermediates before ATP is…
Correct answer: Glycolysis- A. 1
- B. 2
- C. 3
- D. 4
Explanation: One pyruvate produces one NADH during its conversion to acetyl-CoA and two more NADH during its two turns of the Krebs cycle, giving 1 + 2…
Correct answer: 3- A. 1%
- B. 2%
- C. 3%
- D. 4%
Explanation: Anaerobic respiration captures only about 2% of glucose's stored chemical energy in ATP because glycolysis is the only energy-yielding…
Correct answer: 2%