Chapter 15, Problem 15.95P

(a)

Interpretation Introduction

Interpretation:

The structure of the tripeptide Aspartic acid-histidine-tryptophan has to be drawn.

Concept Introduction:

The amino acids are linked by peptide bonds to form the protein chain.  In tripeptides, three amino acids are present.  The amino acid with free amine group $\left({\text{-NH}}_{\text{2}}\right)$ is said to be the N-terminal and amino acid with free carboxyl group $\left({\text{-COO}}^{\text{-}}\right)$ is said to be the C-terminal.

(b)

Interpretation Introduction

Interpretation:

The structure of the tripeptide Glycine-Cysteine-Tyrosine has to be drawn with the charges that exist in cellular fluid.

Concept Introduction:

The amino acids are linked by peptide bonds to form the protein chain.  In tripeptides, three amino acids are present.  The amino acid with free amine group $\left({\text{-NH}}_{\text{2}}\right)$ is said to be the N-terminal and amino acid with free carboxyl group $\left({\text{-COO}}^{\text{-}}\right)$ is said to be the C-terminal.