What is RNA (Ribonucleic Acid)

RNA(Ribonucleic Acid)

It is a single stranded polynucleotide.

By the action of RNA polymerase it is made in nucleus from one strand of DNA.

protein synthesis is the primary function of RNA.

RNA consists of nitrogenous bases, either

purine (adenine or guanine) or pyrimidine

(cytosine or uracil), sugar. (ribose) and

phosphoric acid.

Thymine (pyrimidine) is never pres-

ent in RNA.

There are three kinds of RNA 1.e. messenger

RNA (mRNA), transfer RNA (tRNA) and

ribosomal RNA (rRNA).

mRNA takes the message from DNA to

tRNA.

Just one strand of DNA serves as a tem-

plate for the synthesis of mRNA.

tRNA also called soluble RNA (sRNA)

reads the message and transfers amino

acids to the proper site on the rRNA.

rRNA in ribosome of the endoplasmic

reticulum, synthesize protein from the

amino acids brought by tRNA.

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