Chapter 5, Problem 13RQ

Summary Introduction

To review:

The following amino acids either as polar ornonpolar, and eitheracidic or basic:

a. Glycine

b. Tyrosine

c. Glutamic acid

d. Histidine

e. Proline

f. Lysine

g. Cysteine

f. Aspargine

i. Valine

j. Leucine

Introduction:

An amino acid isa biologicalmicromoleculethat has two functional groups on the samecarbon atom. These functional groups are carboxylic acid (-COOH) and an amino group ( $\text{-NH}$ ). The carbon atom is also bonded with a singlehydrogenatom and aside chain (R). An amino group and a carboxylgroup can neutralize each other and affect the overall polarity of the amino acid. On the basis of polarity, amino acids can be classified into two types:polar amino acidandnonpolar amino acid (uncharged).