An Essential Amino Acid Is One That

An essential amino acid is one that

A) is required for the synthesis of all proteins.
B) must be obtained in the diet because the human body cannot synthesize it.
C) can safely be omitted from the diet because the human body can produce it in unlimited amounts.
D) must be provided in the diet for individuals with specific hereditary enzyme deficiencies.
E) has a relatively simple carbon skeleton.