RNA

Ribonucleic acid (RNA) is a biologically important class of molecules consisting of a long chain of nucleotide units. Each nucleotide consists of a nitrogenous base, a ribose sugar and phosphate. RNA is very similar to DNA, but differs in some important details of structure in the cell, RNA is usually single-stranded DNA, while often double-stranded, RNA nucleotides contain ribose while DNA contains deoxyribose (a type of ribose that lacks one oxygen atom) and the base uracil replaces thymine RNA is present in the DNA. The RNA is transcribed from DNA by enzymes called RNA polymerases and usually further processed by other enzymes. RNA is essential for protein synthesis. Here, a type of RNA, called messenger RNA carries information from DNA to structures called ribosomes. These ribosomes are made of proteins and ribosomes