Question

based on the information in the passage, which statement best describes the formation of an amino acid in humans?
sugars that are consumed are broken down and combined with an amino group from amino acids that are also consumed.
sugars that are produced by the body are broken down and combined with an amino group from amino acids that are also produced
sugars that are produced by the body are broken down and combined with an amino group from amino acids that are consumed
sugars that are consumed are broken down and combined with an amino group from amino acids that are produced by the body.

Explanation:

To solve this, we analyze each option:

1. First, recall that in human amino acid formation, sugars (like from consumed carbohydrates) are broken down. Also, the amino group comes from amino acids produced by the body (non - essential amino acid synthesis: carbon skeleton from sugar breakdown + amino group from other amino acids/body - produced sources).

1. Analyze Option A: Says amino group is from amino acids also consumed. But the amino group source for new amino acid formation in humans (for non - essential) is from amino acids the body produces, not just consumed. So A is wrong.

1. Analyze Option B: Says sugars are produced by the body. But sugars for amino acid formation (in non - essential) come from consumed sugars (carbohydrates) breakdown, not body - produced sugars in this context. So B is wrong.

1. Analyze Option C: Similar to B, sugars are said to be body - produced, and amino group from consumed amino acids. Both parts are incorrect.

1. Analyze Option D: Sugars consumed are broken down (correct, as we get carbon skeletons from dietary carbs) and combined with an amino group from amino acids produced by the body (correct, as the body can transfer amino groups from its own produced amino acids for non - essential amino acid synthesis).

Answer:

D. Sugars that are consumed are broken down and combined with an amino group from amino acids that are produced by the body.