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The human genome consists of _____ rDNA.

(a) 2

(b) 4

(c) 5

(d) 7

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Right option is (a) 2

The best I can explain: The human genome has five different clusters of ribosomal DNA, each on a different chromosome. Ribosomal DNA is the part of DNA that codes for ribosomal RNA, the most abundance type of RNA in a cell.

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