Photorespiration in C3 plants occurs when RuBisCO acts as an oxygenase instead of a carboxylase. This process primarily takes place in which organelles? MCQ with Answer and Explanation

Photorespiration in C3 plants occurs when RuBisCO acts as an oxygenase instead of a carboxylase. This process primarily takes place in which organelles?
A. Mitochondria and Golgi apparatus
B. Chloroplast and Nucleus
C. Peroxisome and Lysosome
D. Chloroplast, Mitochondria, and Peroxisome
Answer: Option D
Solution (By JKExamLibrary)
Photorespiration is a wasteful pathway that occurs when RuBisCO fixes O2 instead of CO2, producing phosphoglycolate. This 2-carbon compound is metabolized through a complex pathway involving three organelles: it is processed in the peroxisome, then the mitochondria, and finally returns to the chloroplast. This process consumes ATP and releases CO2 without producing any sugar.

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Question #1
Identify the correct statement about mutations:
A. Mutations can be inherited if they occur in germ cells.
B. Silent mutations always change the protein sequence.
C. Mutations cannot be spontaneous.
D. All mutations are caused by radiation.

Correct Answer: Option A


Explanation:
Germline mutations can be passed to offspring. Mutations can be spontaneous or induced; silent mutations do not change the amino acid sequence.

This question belongs to: Science Biology
Question #2
Consider statements about human diseases: 1. Cholera is caused by a bacterium. 2. Polio is caused by a virus. 3. Ringworm is caused by a fungus. Which are correct?
A. 2 and 3 only
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Correct Answer: Option B


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Cholera is an acute diarrheal disease caused by the bacterium Vibrio cholerae, typically transmitted through contaminated water and food. Polio (poliomyelitis) is a highly infectious viral disease caused by the poliovirus, which can invade the nervous system and cause paralysis. Ringworm (dermatophytosis) is a common superficial fungal infection of the skin, hair, or nails caused by dermatophytes like Microsporum, Trichophyton, and Epidermophyton. All three statements correctly identify the causative agents.

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The scientist who proposed the cell theory that 'all cells arise from pre-existing cells' is:
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Correct Answer: Option B


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