Bioenergetics| NTS Sindh Mdcat Past Paper MCQs | mosaicbro.com

Bioenergetics| NTS Sindh Mdcat Past Paper MCQs

7 of 47 questions (Page 6 of 7)

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36 Plant pigments responsible for red, yellow, and orange colors in many fruits and vegetables are:
Correct Answer: C
Explanation: Carotenoids (e.g., beta-carotene) produce red/yellow/orange pigments.
37 The complete aerobic oxidation of glucose results in the synthesis of as many as ______ molecules of ATP.
Correct Answer: C
Explanation: Aerobic respiration yields ~36 ATP per glucose (theoretical maximum).
38 Which substance might include the above molecule?
Correct Answer: D
Explanation: Alanine is an amino acid (the question refers to a molecule not shown, but the answer key indicates D).
39 Carbon dioxide fixation can be enhanced by enhancing the efficiency of:
Correct Answer: B
Explanation: RuBP is the CO₂ acceptor in Calvin cycle; its efficiency boosts fixation.
40 Which of the following processes has a net reaction of: Pyruvic acid + 3H₂O + 5 carriers → 3CO₂ + 5 carriers (2H⁺)?
Correct Answer: C
Explanation: Krebs cycle oxidizes pyruvate to CO₂, generating reduced carriers (NADH/FADH₂).
41 The source of oxygen in photosynthesis is:
Correct Answer: D
Explanation: O₂ released in photosynthesis comes from water splitting (photolysis).
42 Pyruvic acid is the end product of ______.
Correct Answer: B
Explanation: Glycolysis converts glucose → pyruvate.
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