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Explain (in one or two lines) the function of following:

1. Promoter

2. tRNA

3. Exons.

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1. Promoter:

It acts as an initiation signal which function as recognition centre for RNA polymerase provided the operator gene is switched on.

2. tRNA:

It acts as an adapter molecule which transfers amino acids to ribosomes for synthesis of polypeptides.

3. Exons:

These are coding sequences or expressed sequences in an eukaryotic gene. The exon sequences appear in mature or processed RNA.

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