Question

operons are operons encoding enzymes that act in catabolism and _______________ operons contain genes coding for anabolic enzymes

catabolic; repressible
repressible, catabolic
anabolic, catabolic
catabolic, anabolic

Explanation:

Catabolic operons encode enzymes for catabolism (breaking - down processes), and anabolic operons encode enzymes for anabolism (building - up processes).

Answer:

D. catabolic, anabolic