Ribonucelic acid (RNA)
- Like DNA, RNA is a macromolecule but comparatively smaller than DNA.
- It is single stranded , formed of polynucleotide chain.
- RNA like DNA is formed of several hundred or thousands of nucleotides arranged in a linear sequence and connected together by 3’-5’ phosphodiester bonds.
- Each nucleotide consists of a ribose sugar, phosphate and one of the four nitrogen bases. Nucleotides of RNA are called ribonucleotide.
- The nitrogen bases in RNA are Adenine, Guanine, Cytosine and uracil. (Thymine of DNA is substituted by uracil of RNA).