Question

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

□ sulfur
□ some amino acids
□ zinc
□ purines and pyrimidines
□ carbon
□ oxygen
□ vitamins

Explanation:

Growth factors are substances that organisms need in small amounts for growth and metabolism. Some amino acids (if an organism can't synthesize them), purines and pyrimidines (for nucleic acid synthesis, if not synthesized), and vitamins (coenzymes/cofactors, often not synthesized) are growth factors. Sulfur, zinc, carbon, oxygen are usually macronutrients or minerals (zinc is a micronutrient but not a typical growth factor in the same category as the others here; sulfur, carbon, oxygen are major elements for structure/energy, not growth factors in the specific sense of organic growth - promoting substances).

Answer:

• Some amino acids
• Purines and pyrimidines
• Vitamins