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. C55 H10 O4 N6 Mg
- B. C55 H70 O6N5 Mg
- C. C55 H71 O6 N4 Mg
- D. C55 H70 O6N4 Mg
Explanation: "The explanation for this question will be added soon!".
Correct answer: C55 H70 O6N4 Mg- A. Bacteriochlorophyls
- B. Redox process
- C. Photosystems
- D. Compensation point
Explanation: A. There are known many different kinds of chlorophylls. Chlorophyll a,b,c,d are found in eukaryotic photosynthetic plants and algae…
Correct answer: Compensation point- A. Absorption spectrum
- B. Spectrophotometer
- C. Carotenoids
- D. Xanthophylls
Explanation: B. It is an instrument which is used to measure relative abilities of different pigments to absorb different wavelenght of lightC.
Correct answer: Absorption spectrum- A. Plastoquione
- B. Photolysis
- C. Plastocyanin
- D. Ferredoxin
Explanation: A. It is an electron acceptor in photosynthesis pathway. C. A copper containing protein acting as electron acceptor in photosynthesis…
Correct answer: Photolysis- A. Chemiosmosis
- B. Atp Synthase
- C. Dark Reactions
- D. Light Reactions
Explanation: B. It is an enzyme required for synthesis of ATP during which hydrogen ions move down their gradient. C.
Correct answer: Chemiosmosis- A. Calvin cycle
- B. Carbon fixation
- C. Reduction phase of calvin cycle
- D. Regeneration of RUBP
Explanation: A. In this reaction, carbon is fixed and reduced resulting in the synthesis of sugars during dark reactionsC.
Correct answer: Carbon fixation- A. Acetic acid
- B. Alpha-ketoglutarate
- C. Pyruvic acid
- D. Citrate
Explanation: A. It is a carboxylic acid of 2 carbon. It is not the end product of glycolysis.B.
Correct answer: Pyruvic acid- A. Antenna complex
- B. Reaction centre
- C. Photosystem
- D. None of these
Explanation: The antenna complex is a light-harvesting membrane-associated aggregate of proteins and photosensitive pigments such as chlorophyll and…
Correct answer: Antenna complex- A. Brain
- B. Heart
- C. Liver
- D. Muscles
Explanation: Lactic acid fermentation occurs in the skeletal muscles. When oxygen is inadequate, pyruvate is converted to lactic acid by lactate…
Correct answer: Muscles- A. 10%
- B. 20%
- C. 30%
- D. 40%
Explanation: About 10% of photosynthesis is carried by terrestrial plants, while the rest occurs in oceans, lakes, and ponds.
Correct answer: 10%- A. 600
- B. 650
- C. 680
- D. 700
Explanation: Photosystems are the protein complexes involved in photosynthesis. Each photosystem is characterized by the wavelength of light to which…
Correct answer: 700- A. Only herbivores die
- B. Only carnivores die
- C. No one will die
- D. Both will die
Explanation: The correct option is D Green plants are the sources of food, energy and oxygen for all organisms.
Correct answer: Both will die- A. Rubisco
- B. Ribulose
- C. Ribulose bisphosphate
- D. Cytochrome
Explanation: Carbon dioxide fixation in dark reaction is carried out by the enzyme Ribulose bisphosphate carboxylase, also known as Rubisco.
Correct answer: Rubisco- A. It occurs during daytime
- B. It uses water with CO2
- C. It requires chlorophyll
- D. It uses oxygen
Explanation: Photosynthesis is the biochemical process that occurs during day time and requires chlorophyll for sugar synthesis and uses CO2 as…
Correct answer: It uses oxygen- A. Mitochondria
- B. Cytoplasm
- C. Stroma of chloroplast
- D. Grana
Explanation: Light dependent phase of photosynthesis takes place in grana of chloroplast in which light energy is converted into chemical energy.
Correct answer: Grana636. The complete aerobic oxidation of glucose results in the synthesis of as many as _ molecules of ATP.
- A. 16
- B. 26
- C. 36
- D. 46
Explanation: The complete aerobic oxidation of glucose results in the synthesis of as many as 36 molecules of ATP.
Correct answer: 36- A. Alcoholic fermentation
- B. Calvin cycle
- C. Aerobic respiration
- D. Lactic Acid fermentation
Explanation: Calvin cycle does not require pyruvate rather just requires RuBP and CO2 for carbon dioxide fixation, as shown by the diagram below.
Correct answer: Calvin cycle- A. Primary Electron Acceptor (PEA) to Plastoquinone (Pq)
- B. Plastoquinone (Pq) to cytochromes
- C. Cytochrome to Plastocyanin (Pc)
- D. Plastocyanin (Pc) to Photosystem I (PS I)
Explanation: When an electron leaves PSII, it is transferred first to a small organic molecule (plastoquinone, Pq), then to a cytochrome complex (Cyt)…
Correct answer: Cytochrome to Plastocyanin (Pc)- A. First
- B. Second
- C. Third
- D. Fourth
Explanation: It is formation of fructose 1, 6 bisphosphate from fructose 6 phosphate.
Correct answer: Third- A. Photon
- B. Spirogyra
- C. Action spectrum
- D. Accessory pigment
Explanation: The correct answer is Option C: Action spectrum. An action spectrum provides a visual representation of the relative effectiveness of…
Correct answer: Action spectrum