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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Consider the amino acids arginine, cysteine, gluta- mine, isoleucine, threonine, and tryptophan. Which have polar R groups, and which have non- polar R groups?

Interpretation Introduction

Interpretation:

Out of the following, amino acid have polar R group and which have nonpolar R group has to be identified.

Concept introduction: Amino acids are the organic molecules that consist of both amine group (NH2) as well as a carboxylic acid group (COOH) present at two different ends along with a side chain (R). The side group is different for different amino acids. The general formula for amino acid is H2NCH(R)COOH.

Explanation

The side groups which are derived from alkanes or aromatic hydrocarbons are classified as non-polar side groups and the amino acids having non-polar side group is called as non-polar amino acids. Side groups which contain a hydroxyl group or any acidic or basic group are classified as polar side groups and the amino acid having polar side group is called as polar amino acids.

Amino acids with polar side group are,

Amino acidSide group (R)

Arginine

Cysteine

Glutamine

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