AP BIOLOGY

Detailed explanation-1: -A protein molecule is made from a long chain of these amino acids, each linked to its neighbor through a covalent peptide bond (Figure 3-1). Proteins are therefore also known as polypeptides. Each type of protein has a unique sequence of amino acids, exactly the same from one molecule to the next.

Detailed explanation-2: -Protein polypeptide chains are linear polymers that are assembled from a repertoire of 20 different standard amino acids joined together through peptide bonds from N-terminus to C-terminus. The identity of each amino acid is determined by its side chain, known as an R group.

Detailed explanation-3: -In a protein molecule, four globin chains are present two alpha chains and two beta chains respectively. Alpha chain possesses 141 amino acids whereas, beta chain possesses 146 amino acids. Therefore, Protein contains Four polypeptide chains.

Detailed explanation-4: -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.

Detailed explanation-5: -A peptide is two or more amino acids joined together by peptide bonds, and a polypeptide is a chain of many amino acids. A protein contains one or more polypeptides. Therefore, proteins are long chains of amino acids held together by peptide bonds.