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Q.
Which of the following represents a peptide chain?
Biomolecules
Solution:
A peptide bond (amide bond) is a covalent chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, causing the release of a molecule of water $(H_2O)$, hence the process is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids. The resulting $- \overset{\underset{||}{O}}{C} - NH-$ bonds is called a peptide bond, and the resulting molecule is an amide. The four - atom functional group $ - \overset{\underset{||}{O}}{C} - NH -$ is called a peptide link.
Hence C represent a peptide chain having $- \overset{\underset{||}{O}}{C} - NH-$ link