Question

select all that apply
which three of the following are growth factors?

zinc
carbon
oxygen
sulfur
vitamins
purines and pyrimidines
some amino acids

Explanation:

Growth factors are specific, required in small amounts for microbial/cell growth, not major macronutrients. Zinc is a trace mineral growth factor. Vitamins act as coenzymes for growth-related enzymes. Some amino acids are essential growth factors if an organism cannot synthesize them. Carbon, oxygen, sulfur are major macronutrients, and purines/pyrimidines are building blocks not classified as typical growth factors here.

Answer:

• Zinc
• Vitamins
• Some amino acids