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Question

Cell nucleus is the site for

I. RNA synthesis
II. Proteins synthesis
III. DNA synthesis

A
I only
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B
II only
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C
III only
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D
I and III only
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E
I, II and III
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Solution

The correct option is D I and III only
The nucleus is the important structure of the cell and fully enclosed in a nuclear membrane. It contains the cells' genetic material organized as DNA and variety of proteins to form chromosomes. This is major site for DNA replication and synthesis of new DNA. The genes are first transcribed, where DNA is read by RNA polymerase to produce messenger RNA (mRNA). The nucleus is therefore the site of RNA and DNA synthesis.
Protein is synthesized from the mRNA in the cytoplasm.
Thus, the correct answer is option D.

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