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Question

Protein synthesis in an animal cell occurs:

A
On ribosomes present in cytoplasm as well as in mitochondria
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B
On ribosomes present in the nucleolus as well as in cytoplasm
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C
Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
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D
Only on the ribosomes present in cytosol
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Solution

The correct option is A On ribosomes present in cytoplasm as well as in mitochondria
The ribosomes are produced in the nucleolus inside the nucleus. They then go out of the nucleus and they may either get embedded in the endoplasmic reticulum or may be present freely in the cytoplasm. The ribosomes are also present in the mitochondria. The ribosomes only synthesize proteins outside the nucleus. Thus, this is the correct answer.

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