Nonessential amino acids
A. are not recycled by the body.
B. can be synthesized from other compounds in the body.
C. are used to synthesize nonessential proteins.
D. all have the same side-chain group.
Question 2
Essential amino acids are defined as
A. those that cannot be made by the body in the amounts required and therefore must be consumed in the diet.
B. those that are difficult to find in a well-balanced diet and must be consumed as supplements.
C. those whose nitrogen-containing amino groups must be added in the liver.
D. those required for the synthesis of a limited number of essential proteins.
The values of Φ and Ψ for all the amino acid
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