Answer:
1) C - proteins
2) D - dipeptide
Step-by-step explanation:
1. Proteins consist of multiple amino acids linked by peptide bonds to form a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid. By convention, a chain under 30 amino acids is often identified as a peptide, rather than a protein.
The shape of a protein determines whether the protein can interact with other molecules. The diagram shows the basis of formation of proteins.
2. Dipeptide is a short protein made up of only two amino acids that are connected by a peptide bond.