Which trace element is essential for the activity of the enzyme delta-aminolevulinic acid dehydratase?

A Zinc ✓
B Copper
C Manganese
D Lead

Explanation

Zinc is a cofactor for the enzyme delta-aminolevulinic acid dehydratase, which is involved in heme synthesis.

Source

Harper's Biochemistry
Minerals and Trace Elements Biochemistry Zinc Medium MEDICAL Confidence: medium