Respiration in Plants Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which molecule acts as the final electron acceptor in anaerobic respiration?

Oxygen
Carbon dioxide
Pyruvate
Water
3

In anaerobic respiration, pyruvate acts as the final electron acceptor, leading to the formation of ethanol or lactic acid.

Which of the following is INCORRECT about the Electron Transport Chain?

It takes place in the inner mitochondrial membrane.
Oxygen is the final electron acceptor.
It generates ATP through substrate-level phosphorylation.
It creates a proton gradient across the membrane.
3

The Electron Transport Chain generates ATP through oxidative phosphorylation, not substrate-level phosphorylation.

Which of the following molecules is regenerated at the end of the Krebs cycle?

Citric acid
Oxaloacetic acid
Acetyl-CoA
Fumaric acid
2

Oxaloacetic acid is regenerated at the end of the Krebs cycle to continue the cycle.

Which type of phosphorylation occurs in the Electron Transport Chain?

Substrate-level phosphorylation
Oxidative phosphorylation
Photophosphorylation
Fermentative phosphorylation
2

Oxidative phosphorylation occurs in the Electron Transport Chain, where ATP is produced using a proton gradient.

Which step of aerobic respiration releases the largest amount of ATP?

Glycolysis
Krebs cycle
Electron Transport Chain
Fermentation
3

The Electron Transport Chain produces the highest number of ATP molecules through oxidative phosphorylation.

Which of the following statements about oxidative phosphorylation is CORRECT?

It occurs in the cytoplasm.
It produces ATP using a proton gradient.
It does not require oxygen.
It occurs before the Krebs cycle.
2

Oxidative phosphorylation uses a proton gradient across the inner mitochondrial membrane to generate ATP.

Which of the following statements about the Krebs cycle is CORRECT?

It directly produces glucose.
It generates both NADH and FADH₂.
It takes place in the cytoplasm.
It does not release carbon dioxide.
2

The Krebs cycle generates NADH and FADH₂, which are later used in the Electron Transport Chain.

Which of the following is INCORRECT about substrate-level phosphorylation?

It occurs in glycolysis.
It occurs in the Krebs cycle.
It requires the Electron Transport Chain.
It directly produces ATP from ADP.
3

Substrate-level phosphorylation does not require the Electron Transport Chain; it occurs in glycolysis and the Krebs cycle.

Which of the following is NOT a component of the Electron Transport System?

Cytochrome c
Ubiquinone
ATP synthase
Ribosomes
4

Ribosomes are not part of the Electron Transport System; they are involved in protein synthesis.

Which of the following is CORRECT about the respiratory quotient (RQ)?

RQ for carbohydrates is 1.
RQ for fats is greater than 1.
RQ for proteins is exactly 2.
RQ is independent of the type of respiratory substrate.
1

When carbohydrates are used as the respiratory substrate, the RQ value is 1.

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