Chapter 21, Problem 9A

(a)

Interpretation Introduction

Interpretation: The structure of peptide with peptide bonds, terminal amino acid and carboxyl group needs to be determined.

Ile-Ala-Gly

Concept Introduction: Proteins are biomolecules, which are composed of certain monomer units such as amino acid. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule.

These amino acids involve in condensation process to form peptides and polypeptides, which further form complex protein molecules. Amino acids are the organic molecules with both ${\text{–NH}}_{\text{2}}$ and $\text{–COOH}$ functional groups bonded on same C atom of the molecule.

Answer to Problem 9A

  

Explanation of Solution

In a tripeptide, N-terminus must be written as left side whereas the C-terminus must be right side.

  

(b)

Interpretation Introduction

Interpretation: The structure of peptide with peptide bonds , terminal amino acid and carboxyl group needs to be drawn.

Gly-Ser

Concept Introduction: Proteins are biomolecules, which are composed of certain monomer units such as amino acid. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule.

These amino acids involve in condensation process to form peptides and polypeptides, which further form complex protein molecules. Amino acids are the organic molecules with both ${\text{–NH}}_{\text{2}}$ and $\text{–COOH}$ functional groups bonded on same C atom of the molecule.

Answer to Problem 9A

  

Explanation of Solution

In a dipeptide Gly-Ser, N-terminus must be written as left side whereas the C-terminus must be right side.

  

(c)

Interpretation Introduction

Interpretation: The structure of peptide with peptide bonds, terminal amino acid and carboxyl group needs to be drawn.

Ser-Gln

Concept Introduction: Proteins are biomolecules, which are composed of certain monomer units such as amino acid. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule.

These amino acids involve in condensation process to form peptides and polypeptides, which further form complex protein molecules. Amino acids are the organic molecules with both ${\text{–NH}}_{\text{2}}$ and $\text{–COOH}$ functional groups bonded on same C atom of the molecule.

Answer to Problem 9A

  

Explanation of Solution

In a dipeptide Ser-Gln, N-terminus must be written as left side whereas the C-terminus must be right side.

  

(d)

Interpretation Introduction

Interpretation: The structure of peptide with peptide bonds, terminal amino acid and carboxyl group needs to be drawn.

Cys-Asn-Gly

Concept Introduction: Proteins are biomolecules, which are composed of certain monomer units such as amino acid. These are carboxylic acids with one amino group bonded on alpha-C atom of the molecule.

These amino acids involve in condensation process to form peptides and polypeptides, which further form complex protein molecules. Amino acids are the organic molecules with both ${\text{–NH}}_{\text{2}}$ and $\text{–COOH}$ functional groups bonded on same C atom of the molecule.

Answer to Problem 9A

  

Explanation of Solution

In a tripeptide Cys-Asn-Gly, N-terminus must be written as left side whereas the C-terminus must be right side.