Question

Amino acids are the building blocks of proteins.
Select the true statements.
Many amino acids linked together form a polypeptide.
Human body cells make essential amino acids from sugar molecules.
Each amino acid has an amino group, a carboxyl group, and an R-group.
A peptide bond forms between two amino acids.

Answer 1

True:
- Many amino acids linked together form a polypeptide. (A polypeptide is a chain of amino acids; folded polypeptides make proteins.)
- Each amino acid has an amino group, a carboxyl group, and an R‑group. (Those are the core parts of the amino acid backbone and its side chain.)
- A peptide bond forms between two amino acids. (The bond links the carboxyl of one to the amino of the next, formed by a dehydration reaction.)

False:
- Human body cells make essential amino acids from sugar molecules. (By definition, essential amino acids cannot be synthesized by the human body and must be obtained from the diet; some nonessential amino acids can be made from sugar intermediates.)