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Respiration MCQs for NEET — Botany Questions with Answers

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The conversion of GTP to GDP with the simultaneous synthesis of ATP from ADP is an example of:

A. Oxidative phosphorylation B. Substrate-level phosphorylation C. Photophosphorylation D. Chemiosmosis

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Explanation

The NCERT text mentions, 'During the conversion of succinyl-CoA to succinic acid a molecule of GTP is synthesised. This is a substrate level phosphorylation. In a coupled reaction GTP is converted to GDP with the simultaneous synthesis of ATP from ADP.'

NEET 2023

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A: ATP is used at two steps in glycolysis. R: First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1,6-diphosphate.

A. Both A and R are true and R is the correct explanation of A. B. Both A and R are true but R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true.

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Explanation

Hexokinase (Glc→Glc-6-P) and PFK (F-6-P→F-1,6-BP) each consume one ATP.

NEET 2023

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Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:

A. Succinic dehydrogenase B. Amylase C. Lipase D. Dinitrogenase

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Explanation

Malonate is a classic competitive inhibitor of succinic dehydrogenase (TCA cycle).

NEET 2023

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Which of the following combinations is required for chemiosmosis?

A. membrane, proton pump, proton gradient, ATP synthase B. membrane, proton pump, proton gradient, NADP synthase C. proton pump, electron gradient, ATP synthase D. proton pump, electron gradient, NADP synthase

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Explanation

Chemiosmosis needs a membrane, proton pump, proton gradient and ATP synthase.

NEET 2023

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Match List I with List II:

List I	List II
A. Oxidative decarboxylation	I. Citrate synthase
B. Glycolysis	II. Pyruvate dehydrogenase
C. Oxidative phosphorylation	III. Electron transport system
D. Tricarboxylic acid cycle	IV. EMP pathway

A. A-III, B-IV, C-II, D-I B. A-II, B-IV, C-I, D-III C. A-III, B-I, C-II, D-IV D. A-II, B-IV, C-III, D-I

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Explanation

A-II (PDH), B-IV (EMP), C-III (ETS), D-I (citrate synthase = first enzyme of TCA).

NEET 2024

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The cofactor of the enzyme carboxypeptidase is:

A. Haem B. Zinc C. Niacin D. Flavin

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Explanation

Carboxypeptidase is a Zn²⁺-containing metalloenzyme.

NEET 2024

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Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of:

A. Enzyme activation B. Cofactor inhibition C. Feedback inhibition D. Competitive inhibition

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Explanation

Malonate, a substrate analogue of succinate, competes for the active site of succinate dehydrogenase.

NEET 2024

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Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

A. Carbohydrates B. Amino acids C. Phospholipids D. Glycerides

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Explanation

Lecithin (phosphatidylcholine) is a classic phospholipid.

NEET 2024

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Match List I with List II.

List I	List II
A. Citric acid cycle	I. Cytoplasm
B. Glycolysis	II. Mitochondrial matrix
C. Electron transport system	III. Intermembrane space of mitochondria
D. Proton gradient	IV. Inner mitochondrial membrane

Choose the correct answer from the options given below:

A. A-IV, B-III, C-II, D-I B. A-II, B-I, C-IV, D-III C. A-II, B-I, C-IV, D-III D. A-III, B-IV, C-I, D-II

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Explanation

TCA — matrix; glycolysis — cytoplasm; ETS — inner membrane; H⁺ gradient — intermembrane space.

NEET 2024

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Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

A. Isocitrate $\to \alpha$-ketoglutaric acid B. Malic acid $\to$ Oxaloacetic acid C. Succinic acid $\to$ Malic acid D. Succinyl-CoA $\to$ Succinic acid

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Explanation

Succinyl-CoA → succinate is a substrate-level phosphorylation (GTP/ATP formed); no redox change at the carbon backbone.

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