The organelle that is the site of the Krebs cycle in the cell is the: MCQ with Answer and Explanation

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The organelle that is the site of the Krebs cycle in the cell is the:

A. Chloroplast stroma

B. Cytoplasm

C. Inner mitochondrial membrane

D. Mitochondrial matrix

Answer: Option D

Solution (By JKExamLibrary)

The Krebs cycle (citric acid cycle) occurs in the mitochondrial matrix in eukaryotes. The enzymes for the cycle are soluble in the matrix. The inner membrane houses the electron transport chain and ATP synthase. Cytoplasm is the site of glycolysis, chloroplast stroma is the site of the Calvin cycle. Thus, the matrix is the correct location.

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Question #1

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Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1, 2, and 3

D. 1 and 3 only

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Correct Answer: Option D

Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.

This question belongs to: Science Biology

Question #2

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The organism that causes ringworm in humans belongs to which group?

A. Fungi

B. Virus

C. Bacteria

D. Protozoa

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Correct Answer: Option A

Explanation:
Ringworm (tinea) is a superficial fungal infection caused by dermatophytes (genera Trichophyton, Microsporum, Epidermophyton) that infect skin, hair, and nails. It is not a worm. Bacterial skin infections include impetigo, viral include warts, protozoan include leishmaniasis. Fungi are treated with antifungal agents.

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Question #3

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In the five-kingdom classification, eukaryotic unicellular organisms with various modes of nutrition are placed in:

A. Protista

B. Fungi

C. Monera

D. Plantae

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Correct Answer: Option A

Explanation:
Kingdom Protista includes diverse unicellular eukaryotes like protozoans, slime molds, and unicellular algae. They can be autotrophic, heterotrophic, or mixotrophic. Monera contains prokaryotes, Fungi are multicellular eukaryotes (except yeast) with absorptive nutrition, Plantae are multicellular autotrophs. Protista is a paraphyletic group in modern cladistics but used in the five-kingdom system.

This question belongs to: Science Biology

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