Chapter 22, Problem 22.86P

Interpretation Introduction

(a)

Interpretation:

The structure of lysine should be drawn above its isoelectric point.

Concept Introduction:

Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.

Interpretation Introduction

(b)

Interpretation:

The structure of lysine should be drawn below its isoelectric point.

Concept Introduction:

Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.

Interpretation Introduction

(c)

Interpretation:

The structure of lysine should be drawn at its isoelectric point.

Concept Introduction:

Amino acids are called as zwitterions. At all the pH ranges, they consist an ionic character. At low pH, an amino acid is a positive ion and at high pH it is negative ion. Amino acids have equal positive and negative charges at an intermediate pH. This pH is mentioned as an isoelectric point.