30.
Which of the followed statement about aminolevulinate synthase (ALA synthase ) is correct ?
A:
ALA synthase catalyses the rate-limiting reaction in haem degradation
B:
ALA synthase catalyses the rate-limiting reaction in haem synthesis
C:
ALA synthase is decreased in patients with acute intermittent porphyria.
D:
ALA synthase synthesis decreases in individuals treated with drugs such as barbiturates.
The answer is:
B