Explain (in one or two lines) the function of the followings: (a) Promoter
(b) tRNA
(c) Exons

A promoter is an individual or organization that helps raise money for some type of investment activity. Promoters are often used for penny stocks, where false promises and misrepresentation of the company or its prospects have become commonplace

A transfer RNA is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length, that serves as the physical link between the mRNA and the amino acid sequence of proteins. Transfer RNA does this by carrying an amino acid to the protein synthetic machinery of a cell called the ribosome.

Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns. ... Splicing produces a mature messenger RNA molecule that is then translated into a protein.

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