transfer RNA (tRNA)
Transfer RNA is involved in protein synthesis in that it brings the correct amino acid to the ribosomes. In order for this to occur a specific tRNA must form a covalent bond with a specific amino acid.
The are many different tRNAs in a cell, each transcribed from a different tRNA gene. With regard to protein synthesis the different tRNA have three important regions:
The diagram on the left represents a single stranded transfer RNA molecule. The dots represent the nucelotides of the RNA. The three red dots at the bottom represent the anticondon region of the RNA. The region depicted by the green dots represent the place on the tRNA where the amino acids form a covalent bond with the transfer RNA.