Question

Amino acids are connected together in a chain to form polypeptides. Does it happen with disulphide bonds?

Answer 1

Hint: Multiple amino acids are joined together by peptide bonds to form a lengthy chain within a protein. A biological reaction removes a water molecule as it connects the amino group of one amino acid to the carboxyl group of a neighbouring amino acid to generate peptide bonds.

Complete answer:
Protein monomers are amino acids. A polypeptide chain is made up of several amino acids linked together by peptide bonds. To improve the protein structure, two amino acids may create a disulfide link (S-S).
Twenty amino acids are used in the translation of proteins in living cells. A carboxyl group and an amino group are found in each amino acid.
A peptide bond is formed when the carboxyl group of one amino acid combines with the amino group of another amino acid (dehydration synthesis process).
Proteins are linear polymers generated by a peptide bond connecting the -carboxyl group of one amino acid to the -amino group of another amino acid (also called an amide bond). The loss of a water molecule occurs when a dipeptide is formed from two amino acids.
This reaction's equilibrium is on the side of hydrolysis rather than synthesis. As a result, the biosynthesis of peptide bonds necessitates the use of free energy. Nonetheless, peptide bonds are kinetically highly durable; in the absence of a catalyst, the lifespan of a peptide bond in aqueous solution approaches 1000 years.
A polypeptide chain is made up of a succession of amino acids linked by peptide bonds, and each amino acid unit in a polypeptide is termed a residue. Because the endpoints of a polypeptide chain are distinct, with a -amino group on one end and a -carboxyl group on the other, it possesses polarity. By convention, the amino terminus is considered to represent the start of a polypeptide chain, and the sequence of amino acids in a polypeptide chain is written from there. Thus, in the pentapeptide Tyr-Gly-Gly-Phe-Leu, Tyr-Gly-Gly-Phe-Leu, Tyr-Gly-Gly-Phe-Leu (YGGFL).
The amino-terminal (N-terminal) residue is phenylalanine, while the carboxyl-terminal (C-terminal) residue is leucine. LFGGY (Leu-Phe-Gly-Gly-Tyr) is a unique pentapeptide having unique chemical characteristics.

Note:-
A peptide bond, or a covalent chemical link between two molecules, keeps the two amino acids together (in this case, two amino acids). It happens when one molecule's carboxylic group combines with another's amino group, connecting the two molecules and releasing a water molecule.