Messenger RNA (mRNA): - carry genetic instructions in the form of triplet bases or codons from DNA in the cell nucleus to ribosomes for protein synthesis.

Transfer RNA (tRNA): - a cloverleaf-like shape nucleotide that carries anti-codon at one end and amino acid at the other end. It takes amino acid to the area of ribosomes. There is at least one tRNA molecule for each of the 20 amino acids found in proteins.

Ribosomal RNA (rRNA): - composes ribosomes for protein synthesis. In Eukaryotic cells, rRNA is produced in a nucleolus within the nucleus. There, it joins with proteins manufactured in the cytoplasm to form two ribosomal subunits, one large and one small.