Short Answer Questions - Structure of amino acids and proteins
1. Serine, when a component of protein, can form disulphide bonds. True or false?
False. Only cysteine can form disulphide bonds. Two cysteine residues in a protein can form such a bond, known as a 'disulphide bridge'.
2. Tyrosine is an aromatic amino acid. True or false?
True. The structure of tyrosine is based on benzene which is an aromatic compound.
3. Valine, a component of the insulin molecule, is a ß-amino acid. True or false?
False. All amino acids occurring naturally in proteins are α-amino acids.
4. In proteins, the residues of tyrosine, threonine and methionine can all participate in phosphorylation reactions. True or false?
False. The amino acids with hydroxyl groups, i.e. tyrosine, threonine and serine, can participate in phosphorylation reactions.
