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Aggregated clusters of rDNA in a cell are called _______________

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Aggregated clusters of rDNA in a cell are called _______________

(a) nucleoli

(b) chromatin

(c) chromosome

(d) ribosome

I had been asked this question in an online quiz.

My query is from Gene Expression in section Gene Expression of Cell Biology

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The correct option is (a) nucleoli

The best I can explain: In a non-dividing cell (the cell which is in interphase), the clusters of rDNA come together to form irregularly shaped nuclear structures called nucleolus (plural nucleoli). The nucleoli are dense with primary RNA transcripts.

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