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Non-membranous nucleoplasmic structures in nucleus are the site for active synthesis of

1. tRNA
2. protein synthesis
3. mRNA
4. rRNA

Correct answer: rRNA

Solution

The nucleolus is a non-membranous nucleoplasmic structure and is the main site of rRNA synthesis and ribosome subunit assembly. Protein synthesis occurs on ribosomes in the cytoplasm, while mRNA and tRNA are synthesized elsewhere in the nucleus but not in these structures specifically.

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