Chapter 27, Problem 27.24P

(a)

Interpretation Introduction

Interpretation:

The structural formula of the amino acid leucine most prevalent at $\text{pH}$ 10.0 has to be drawn.

Concept Introduction:

The isoelectric point ($\text{pI}$) of an amino acid is said to be the $\text{pH}$ at which the molecules in the amino acid solution have net charge zero.  At isoelectric point, the Zwitter ion form of amino acids is more prominent.

When the $\text{pH}$ of the amino acid is greater than the $\text{pI}$ of the amino acid, it has a net negative charge.  When $\text{pH}$ of the amino acid is lesser than the $\text{pI}$ of the amino acid, it has net positive charge.

(b)

Interpretation Introduction

Interpretation:

The structural formula of the amino acid valine most prevalent at $\text{pH}$ 10.0 has to be drawn.

Concept Introduction:

The isoelectric point ($\text{pI}$) of an amino acid is said to be $\text{pH}$ at which the molecules in the amino acid solution have net charge zero.  At isoelectric point, the Zwitter ion form of amino acids is more prominent.

When $\text{pH}$ of the amino acid is greater than $\text{pI}$ of the amino acid, it has a net negative charge.  When $\text{pH}$ of the amino acid is lesser than $\text{pI}$ of the amino acid, it has net positive charge.

(c)

Interpretation Introduction

Interpretation:

The structural formula of the amino acid proline most prevalent at $\text{pH}$ 10.0 has to be drawn.

Concept Introduction:

The isoelectric point ($\text{pI}$) of an amino acid is said to be $\text{pH}$ at which the molecules in the amino acid solution have net charge zero.  At isoelectric point, the Zwitter ion form of amino acids is more prominent.

When $\text{pH}$ of the amino acid is greater than $\text{pI}$ of the amino acid, it has a net negative charge.  When $\text{pH}$ of the amino acid is lesser than $\text{pI}$ of the amino acid, it has net positive charge.

(d)

Interpretation Introduction

Interpretation:

The structural formula of the amino acid aspartic acid most prevalent at $\text{pH}$ 10.0 has to be drawn.

Concept Introduction:

The isoelectric point ($\text{pI}$) of an amino acid is said to be $\text{pH}$ at which the molecules in the amino acid solution have net charge zero.  At isoelectric point, the Zwitter ion form of amino acids is more prominent.

When $\text{pH}$ of the amino acid is greater than $\text{pI}$ of the amino acid, it has a net negative charge.  When $\text{pH}$ of the amino acid is lesser than $\text{pI}$ of the amino acid, it has net positive charge.