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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