INTRO. TO CHEM LOOSELEAF W/ALEKS 18WKCR
INTRO. TO CHEM LOOSELEAF W/ALEKS 18WKCR
5th Edition
ISBN: 9781264125609
Author: BAUER
Publisher: MCG
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Chapter 17, Problem 110QP

(a)

Interpretation Introduction

Interpretation:

The structure that corresponds to tripeptide Leu-Ser-Ala is to be identified. The other tripeptides in the given structures are to be identified.

(a)

Expert Solution
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Explanation of Solution

The simplest amino acid is alanine after glycine because the side chain in alanine is the methyl group CH3 that is connected to the α- carbon atom. Leucine is the amino acid that consists of glycine in which the hydrogen atom is replaced by an isobutyl group CH2CHCH32 . Serine is the amino acid that consists of side chain that has hydroxymethyl group CH2OH . In the structure D, the first amino acid has a side chain CH2CHCH32 . Thus, it is leucine Leu . The second amino acid has a side chain CH2OH , so the second amino acid is serine Ser and the side chain in the third amino acid is CH3 , so it is alanine. Thus, the structure represents the tripeptide Leu-Ser-Ala .

In the structure A, the first amino acid has the side chain CHCH32 , this means that first amino acid is valine Val . The second amino acid has a side chain CH2SH , so, the second amino acid is cysteine Cys . The third amino acid has methyl group CH3 in its side chain, this means the third amino acid is alanine Ala . Therefore, the structure A represents the tripeptide Val-Cys-Ala .

(b)

Interpretation Introduction

Interpretation:

The other tripeptides in the given structures are to be identified.

(b)

Expert Solution
Check Mark

Explanation of Solution

In the structure B, the first amino acid has methyl group CH3 in its side chain. This means that the first amino acid is alanine Ala . The second amino acid has hydroxymethyl group CH2OH in its side chain. Thus, the second amino acid is serine Ser . The third amino acid has isobutyl group CH2CHCH32 in its side chain. Thus, the third amino acid is Leucine Leu . Therefore, the structure represents the tripeptide Ala-Ser-Leu .

(c)

Interpretation Introduction

Interpretation:

The other tripeptides in the given structures are to be identified.

(c)

Expert Solution
Check Mark

Explanation of Solution

In the structure C, the first amino acid has hydrogen atom and it is not replaced by any substituent. So, the first amino acid is glycine Gly . The second amino acid has CH2OH in its side chain. Thus, the second amino acid is serine Ser . The third amino acid has methyl group CH3 in its side chain. Thus, the third amino acid is alanine Ala . Therefore, the structure C represents the peptide Gly-Ser-Ala .

(d)

Interpretation Introduction

Interpretation:

The other tripeptides in the given structures are to be identified.

(d)

Expert Solution
Check Mark

Explanation of Solution

In the structure D, the first amino acid has a side chain CH2CHCH32 . Thus, it is leucine Leu . The second amino acid has a side chain CH2OH , so the second amino acid is serine Ser and the side chain in the third amino acid is CH3 , so it is alanine. Thus, the structure represents the tripeptide Leu-Ser-Ala .

(e)

Interpretation Introduction

Interpretation:

The other tripeptides in the given structures are to be identified.

(e)

Expert Solution
Check Mark

Explanation of Solution

In the structure E, first amino acid has isobutyl group CH2CHCH32 in its side chain. Thus, the first amino acid is Leucine Leu . The second amino acid has CHOHCH3 in its side chain. This means that the second amino acid is threonine Thr . The third amino acid has a methyl group CH3 in its side chain. Thus, the third amino acid is alanine Ala . Thus, the structure E represents the tripeptide Leu-Thr-Ala .

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Chapter 17 Solutions

INTRO. TO CHEM LOOSELEAF W/ALEKS 18WKCR

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