Question

1. compounds that are needed for enzymes to function properly are

a. buffers.
b. steroids.
c. vitamins.
d. heavy metals.

Explanation:

Enzymes are biological catalysts. Many enzymes require co - factors to function properly. Vitamins can act as co - factors or precursors of co - factors. For example, vitamin B - complex is involved in the formation of co - enzymes that are essential for enzyme - catalyzed reactions in the body. Buffers (A) are mainly for maintaining pH balance. Steroids (B) are a type of lipid with various functions like being part of cell membranes or acting as hormones. Heavy metals (D) are often toxic and do not help enzymes function properly.

Answer:

C. vitamins.