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

(a) Promoter

(b) tRNA

(c) Exons

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(a) Promoter :

It is a gene that lies near operator which functions as binding site structural genes if operator allows.

(b) tRNA :
Functions as adapter molecule that picks  up a particular amino – acid from cellular pool and takes same over A site, m – RNA for incorporation into polypeptide.

(c) Exons :
Coding segments present in primary transcript which on splicing by snRNP’s get joined to form functional m-RNA.

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