Nucleic Acids 1. Enzymes are a special class of proteins which are used up by biological reactions. Citric acid metabolism 4.
Transcription is the process by which DNA directs the synthesis of mRNA during protein biosynthesis.
DNA and RNA are polynucleotides. RNA is generally a single strand of helical polynucleotides. Messenger RNA is synthesized outside of the cell nucleus. At one end of a transfer RNA molecule is a trinucleotide base sequence called the anticodon.