Question

the class of enzyme that catalyzes the conversion of l - tyrosine to d - tyrosine is
oxidoreductases
isomerases
ligases
transferases
lyases
hydrolases
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Explanation:

• Oxidoreductases: Catalyze oxidation - reduction reactions.
• Isomerases: Catalyze the conversion of a molecule from one isomer to another. L - tyrosine and D - tyrosine are isomers (enantiomers in this case as they differ in the spatial arrangement around the chiral center).
• Ligases: Catalyze the joining of two molecules with the consumption of ATP.
• Transferases: Catalyze the transfer of a functional group from one molecule to another.
• Lyases: Catalyze the addition or removal of groups without hydrolysis or oxidation - reduction.
• Hydrolases: Catalyze hydrolysis reactions (breaking bonds with the addition of water).

Since the reaction is the conversion of one isomer (L - tyrosine) to another (D - tyrosine), the enzyme class is isomerases.

Answer:

isomerases