<P> Ribonucleic acid ( RNA ) is a polymeric molecule essential in various biological roles in coding , decoding , regulation , and expression of genes . RNA and DNA are nucleic acids , and , along with lipids , proteins and carbohydrates , constitute the four major macromolecules essential for all known forms of life . Like DNA , RNA is assembled as a chain of nucleotides , but unlike DNA it is more often found in nature as a single - strand folded onto itself , rather than a paired double - strand . Cellular organisms use messenger RNA ( mRNA ) to convey genetic information ( using the letters G , U , A , and C to denote the nitrogenous bases guanine , uracil , adenine , and cytosine ) that directs synthesis of specific proteins . Many viruses encode their genetic information using an RNA genome . </P>
<P> Ribonucleic acid ( RNA ) is a polymeric molecule essential in various biological roles in coding , decoding , regulation , and expression of genes . RNA and DNA are nucleic acids , and , along with lipids , proteins and carbohydrates , constitute the four major macromolecules essential for all known forms of life . Like DNA , RNA is assembled as a chain of nucleotides , but unlike DNA it is more often found in nature as a single - strand folded onto itself , rather than a paired double - strand . Cellular organisms use messenger RNA ( mRNA ) to convey genetic information ( using the letters G , U , A , and C to denote the nitrogenous bases guanine , uracil , adenine , and cytosine ) that directs synthesis of specific proteins . Many viruses encode their genetic information using an RNA genome . </P>
types of rnas carries information for making a single type of protein
types of rnas carries information for making a single type of protein
messenger RNA ( mRNA )
messenger RNA ( mRNA )