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

(a) Promoter

(b) tRNA

(c) Exons

(a) Promoter:

Promoter defines the start process of the transcription and is located at the start of the strand. It also provides binding site to RNA polymerase.

(b) tRNA:

tRNA or transfer RNA is a type of RNA that brings amino acids and reads the genetic code.

(c) Exons:

Exons are the coding sequences or expressed sequences in eukaryotes.