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Identify the statement that is incorrect.

1. The α-carbon in an α-amino acid is chiral.
2. Proteins occurring in the human body are of the L-configuration.
3. The human body is able to synthesize every protein it requires.
4. At pH 7, amino and carboxyl groups are present in ionized form.

Correct answer: The human body is able to synthesize every protein it requires.

Solution

The body cannot synthesise all the amino acids it needs; the essential amino acids must come from the diet, so the body cannot make every protein it requires. The other statements are correct.

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