(D) Balbiani rings are large puffs found in polytene chromosomes. These structures are sites of active transcription where a large amount of $mRNA$ is

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(D) Balbiani rings are large puffs found in polytene chromosomes. These structures are sites of active transcription where a large amount of $mRNA$ is synthesized. These $mRNA$ molecules may remain stored temporarily within the puffs,which are transient structures formed during specific developmental stages.