Respiration in Plants Chapter-Wise Test 8

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a product of fermentation in muscle cells?

Ethanol
Carbon dioxide
Lactic acid
Acetyl-CoA
3

In muscle cells, anaerobic respiration leads to the formation of lactic acid as a byproduct.

What is the function of ATP synthase in the Electron Transport Chain?

Transfers electrons to oxygen
Pumps protons across the membrane
Synthesizes ATP using proton gradient
Reduces NAD⁺ to NADH
3

ATP synthase utilizes the proton gradient created by the Electron Transport Chain to produce ATP.

What is the total net ATP gain from one molecule of glucose in aerobic respiration?

2 ATP
4 ATP
32 ATP
38 ATP
4

A total of 38 ATP molecules are produced per glucose molecule in aerobic respiration.

Which of the following statements about anaerobic respiration is INCORRECT?

It occurs in some prokaryotic organisms.
It generates less ATP than aerobic respiration.
It requires oxygen to proceed.
It produces ethanol or lactic acid as byproducts.
3

Anaerobic respiration occurs in the absence of oxygen.

Which enzyme catalyzes the conversion of succinate to fumarate in the Krebs cycle?

Fumarase
Succinate dehydrogenase
Aconitase
Malate dehydrogenase
2

Succinate dehydrogenase catalyzes the oxidation of succinate to fumarate, producing FADH₂.

Which step of cellular respiration generates carbon dioxide?

Glycolysis
Fermentation
Krebs cycle
Electron Transport Chain
3

The Krebs cycle releases carbon dioxide as a byproduct of the decarboxylation reactions.

Which enzyme converts pyruvate into Acetyl-CoA before entering the Krebs cycle?

Pyruvate kinase
Hexokinase
Pyruvate dehydrogenase
Enolase
3

Pyruvate dehydrogenase catalyzes the oxidative decarboxylation of pyruvate to form Acetyl-CoA.

Which of the following is NOT a feature of the Electron Transport Chain?

Takes place in the inner mitochondrial membrane
Uses oxygen as the final electron acceptor
Produces ATP through oxidative phosphorylation
Directly produces glucose
4

The Electron Transport Chain does not produce glucose; it generates ATP and water as end products.

Which of the following statements about the link reaction is CORRECT?

It converts pyruvate into Acetyl-CoA.
It produces glucose from pyruvate.
It occurs in the cytoplasm.
It does not release carbon dioxide.
1

The link reaction converts pyruvate into Acetyl-CoA, which enters the Krebs cycle.

Which component of the Electron Transport Chain directly transfers electrons to oxygen?

Cytochrome c
Complex III
Complex IV
ATP Synthase
3

Complex IV (Cytochrome c oxidase) transfers electrons to oxygen, forming water.

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