How can the amino acid chain of one protein be different from the amino acid chain of another protein?

When connected together by a series of peptide bonds, amino acids form a polypeptide, another word for protein. The polypeptide will then fold into a specific conformation depending on the interactions (dashed lines) between its amino acid side chains. I hope this answers your question. Enjoy the rest of your day.

The answer would be b. it is a learned trait

Ibelieve is d but i’m not 100% sure