Question

1. which of the following is a nonessential amino acid?

methionine
serine
phenylalanine
isoleucine

1. proteins that are altered on exposure to acid or alkaline substances, heat, or agitation are said to be:

denatured
oxidized
fermented
hydrolyzed

Explanation:

For question 7, essential amino acids cannot be synthesized by the human body and must be obtained from the diet. Methionine, phenylalanine, and isoleucine are essential amino acids, while serine is a non - essential amino acid. For question 8, denaturation of proteins occurs when they are exposed to factors like acid, alkaline substances, heat, or agitation, which disrupt their native structure. Oxidation involves the loss of electrons, fermentation is a metabolic process by microorganisms, and hydrolysis is the breakdown of a compound by water.

Answer:

1. B. Serine
2. A. Denatured