Q1
NADP+ is reduced to NADPH in
Correct Answer
Option A
Solution
(a) NADP+ is reduced to NADPH in the HMP (Hexose Monophosphate/Pentose Phosphate Pathway).
Respiration in Plants
Q2
Respiratory Quotient (RQ) value of tripalmitin is
Correct Answer
Option B
Solution
(b) RQ of fats ≈ 0.7 (tripalmitin: 102 CO2/145 O2 = 0.703).
Q3
Maximum amount of energy/ATP is liberated on oxidation of
Correct Answer
Option A
Solution
(a) Fats yield more ATP per gram than carbohydrates or proteins due to higher H:O ratio.
Q4
Site of respiration in bacteria is
Correct Answer
Option C
Solution
(c) Mesosomes are invaginations of plasma membrane in bacteria — site of respiratory enzymes.
Q5
Net gain of ATP molecules during aerobic respiration is
Correct Answer
Option A
Solution
(a) Net gain of 36 ATP (2 used in link reactions, 38 gross - 2 = 36 net).
Q6
Which metabolite is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
Correct Answer
Option C
Solution
(c) Acetyl CoA is the common entry point into the Krebs cycle from all three macronutrients.
Q7
Terminal cytochrome of respiratory chain which donates electrons to oxygen is
Correct Answer
Option D
Solution
(d) Cytochrome a3 (part of Complex IV/cytochrome c oxidase) is the terminal electron donor to O2.
Q8
Oxidative phosphorylation is production of
Correct Answer
Option C
Solution
(c) Oxidative phosphorylation: synthesis of ATP using energy from electron transport in respiration.
Q9
End product of citric acid/Krebs cycle is
Correct Answer
Option D
Solution
(d) Net products of Krebs cycle per turn: 2 CO2, 3 NADH, 1 FADH2, 1 GTP.
Q10
Which of the following is essential for conversion of pyruvic acid into acetyl CoA?
Correct Answer
Option D
Solution
(d) Oxidative decarboxylation of pyruvate requires LAA (lipoic acid amide), TPP, and NAD.
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