Biotin is involved in which of the following types of reactions? A: Carboxylation B: Deamination C: Decarboxylation D: Hydroxylation

The bioavailability of L-dopa is very low, this is due to A: difficulty to pass through the brain barrier B: rapid acetylation in liver C: peripheral hydroxylation D: a low absorption rate E: rapid peripheral decarboxylation

Hypophosphatemia can bring about effects on the body. Which of the following takes place in hypophosphatemia? ( ) A: Impaired renal function B: Oxygen-hemoglobin dissociation curve shifts to the right C: Thrombocytopenia D: Deficiency of ATP production E: Altered vitamin D hydroxylation