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Molecular Basis Of Inheritance

Question
CBSEENBI12002327
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Ribosomal RNA is actively synthesised in 

  • lysosomes

  • nucleolus

  • nucleoplasm

  • ribosomes

Solution

B.

nucleolus

In eukaryotes, the site of synthesis of most of the ribosomal RNA (rRNA) is nucleolus. The nucleolar organiser contains many copies of ribosomal DNA (repetitive DNA). The RNA cistron of nucleolar DNA forms 45 S precursor with the help of RNA polymerase. This 45 S RNA undergoes to give 18S, 28S and 5.8 S rRNA units. Out of different rRNAs, the 5S rRNA is not synthesized in nucleolus. It is synthesized outside it. 

Some More Questions From Molecular Basis of Inheritance Chapter

Suggest one evidence to prove that RNA was first genetic material.

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