BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Two amino acids, serine and threonine, contain aliphatic hydroxyl groups (that is, an oxygen atom bonded to a hydrogen atom, represented as ―OH). Tyrosine possesses a hydroxyl group in the aromatic ring, making it a phenol derivative.

Detailed explanation-2: -Serine is one of two hydroxyl amino acids. Both are commonly considered to by hydrophilic due to the hydrogen bonding capacity of the hydroxyl group.

Detailed explanation-3: -This is the case of serine [CH2OH CH(NH2) COOH], with a −CH2OH side chain. The hydroxyl group can establish additional intramolecular hydrogen bonds as a proton donor to the amino group or to the carboxyl group or as a proton acceptor through the nonbonding electron pair at its oxygen atom.

Detailed explanation-4: -The alcohol class of amino acids has a side chain containing a hydroxyl group. This includes the amino acids serine and threonine.