Balbiani rings are sites of

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(B) : In certain developmental stages,polytene chromosomes exhibit conspicuous swellings known as chromosome puffs. The larger swellings are referred

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$RNA$ and protein synthesis

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(B) : In certain developmental stages,polytene chromosomes exhibit conspicuous swellings known as chromosome puffs. The larger swellings are referred to as Balbiani rings.In the region of a puff or Balbiani ring,the $DNA$ strands uncoil,become transcriptionally active,and produce numerous copies of $mRNA$.The $mRNA$ molecules may be temporarily stored in the puff,where they undergo translation to synthesize proteins.Thus,Balbiani rings are the primary sites of $RNA$ and protein synthesis.

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