Chapter 18, Problem 18.65AP

(a)

Interpretation Introduction

Interpretation:

Amino acid present in the given peptide has to be identified and named.

Concept introduction:

• Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
• Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ group is considered as side chain, when all these are bonded to same carbon atom.
• The symbol is chosen for amino acid is derived from its trivial name. The name is usually represented by using the first three letter of the trivial name. The first letter is capital letter followed by small letter.

(b)

Interpretation Introduction

Interpretation:

$\text{N-terminal}$ and $\text{C-terminal}$ of the given amino acids of the peptide has to be identified.

Concept introduction:

• Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
• Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ group is considered as side chain, when all these are bonded to same carbon atom.
• $\text{N-terminal}$ amino acids are those with free $-N{H}_3{}^{+}$ group at the end of the protein.
• $\text{C-terminal}$ amino acids are those with $-CO{O}^{-}$ group at the end of the protein.