Question

question 22 how many amino acids are considered to be essential? 20 9 8 15

Explanation:

Essential amino acids are those the body can't synthesize and must get from diet. For humans, there are 9 essential amino acids (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine). The other options don't match this established biological fact.

Answer:

B. 9