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.
Last updated
Read the Bioenergetics notesFree MDCAT chapter notes with key terms1,378 questions · page 52 of 69
- A. ATP
- B. NADPH2
- C. O2
- D. All A, B, C
Explanation: ATP (adenosine triphosphate) is produced through various cellular processes, primarily during cellular respiration and photosynthesis.The…
Correct answer: ATP- A. Lipids
- B. Carbohydrates
- C. ATP
- D. Proteins
Explanation: ATP (adenosine triphosphate) is produced through various cellular processes, primarily during cellular respiration and photosynthesis.The…
Correct answer: ATP- A. Cytosol
- B. Outer Membrane
- C. Matrix
- D. Inner Membrane
Explanation: The matrix of a mitochondrion refers to the central compartment enclosed by the inner mitochondrial membrane.
Correct answer: Matrix- A. Used in photosynthesis
- B. Soluble in organic solvents
- C. Present in plants
- D. Have different forms
Explanation: Chlorophyll 'b' does not have different forms.
Correct answer: Have different forms- A. Oxaloacetate
- B. Succinate
- C. Alpha-ketoglutarate
- D. Isocitrate
Explanation: Alpha-ketoglutarate, also known as 2-oxoglutarate, is a key intermediate in several metabolic pathways, including the citric acid cycle…
Correct answer: Alpha-ketoglutarate- A. Cristae
- B. Mitochondrial matrix
- C. Inter-membrane space
- D. Cytoplasm
Explanation: Cristae (singular: crista) are internal, folded structures found in the inner mitochondrial membrane.
Correct answer: Cristae- A. 28
- B. 38
- C. 36
- D. 40
Explanation: Net gain of ATP molecule produced in algae after the complete breakdown of one glucose molecule during aerobic respiration is 36.
Correct answer: 36- A. One
- B. Two
- C. Four
- D. Three
Explanation: The explanation for this question will be added soon!
Correct answer: Two- A. C3 pathway
- B. Sugar synthesis phase
- C. Dark reactions
- D. All of these
Explanation: Calvin Cycle is also named as C3 pathway because the product of initial carbon fixation is a three carbon compound.
Correct answer: All of these1030. In which stage of aerobic respiration, 2-carbon molecules are oxidized completely to carbon dioxide?
- A. Glycolysis
- B. Krebs cycle
- C. ETC
- D. Calvin cycle
Explanation: The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a central pathway in cellular respiration that…
Correct answer: Krebs cycle- A. External respiration
- B. Pulmonary respiration
- C. Cellular respiration
- D. Cutaneous respiration
Explanation: Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy…
Correct answer: Cellular respiration- A. Citric acid, Lactic acid, Carbon dioxide, and Water
- B. Ethyl alcohol, Citric acid, and Carbon dioxide
- C. Ethyl alcohol, Lactic acid, Carbon dioxide, and Water
- D. Methanol, Lactic acid, Citric acid
Explanation: End products or yeast fermentation, bacterial fermentation, and anaerobic respiration are ethyl alcohol, lactic acid, carbon dioxide, and…
Correct answer: Ethyl alcohol, Lactic acid, Carbon dioxide, and Water- A. All types of cells
- B. All primitive cells
- C. All anaerobic cells
- D. All aerobic cells
Explanation: Oxidative phosphoryltion, synthesis of ATP in the presence of oxygen occurs in all aerobic cells.
Correct answer: All aerobic cells- A. Ferredoxin
- B. Plastocyanin
- C. Plastoquinone
- D. Carotenoids
Explanation: Plastoquinone is a lipophilic molecule that functions as an electron carrier in the electron transport chain of photosynthesis.
Correct answer: Plastoquinone- A. Plasma Membrane
- B. Thylakoid
- C. Cristae
- D. Mesosome
Explanation: Chemiosmosis is the movement of ions across a semipermeable membrane-bound structure, down their electrochemical gradient.
Correct answer: Plasma Membrane- A. 38 ATP
- B. 15 ATP
- C. 12 ATP
- D. 19 ATP
Explanation: 12 ATP molecules shouId be produced from the complete oxidation of a molecule of active acetate or acetyl CoA.
Correct answer: 12 ATP- A. Phosphorylase
- B. Phosphatase
- C. Hexokinase
- D. Gluco-synthetase
Explanation: Hexokinase is an enzyme that catalyzes the phosphorylation of glucose or other hexoses (six-carbon sugars) to produce hexose phosphate.
Correct answer: Hexokinase- A. Membrane system
- B. Set of enzymes
- C. Membrane system and set of enzymes
- D. Chlorophyll
Explanation: Thylakoid membranes making grana and enzymes associated with photosynthesis, attached to these membranes, are suspended in stroma of…
Correct answer: Membrane system and set of enzymes- A. Thylakoid membranes
- B. Outer chloroplast membrane
- C. Lamellar membranes
- D. Inner chloroplast membrane
Explanation: Thylakoid membranes sites for cyclic and non-cyclic photophosphorylation.
Correct answer: Thylakoid membranes1040. Chlorophyll and other pigments absorb light energy which is converted into chemical energy of:
- A. NADH and NADPH
- B. ATP and NADPH
- C. ATP and NADH
- D. FADH and NADPH
Explanation: It is assimilatory power (ATP) and reducing power (NADPH) respectively required for dark reaction.
Correct answer: ATP and NADPH