Biochemistry: The Molecular Basis of Life
Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 5, Problem 2Q
Summary Introduction

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The reason, due to which the immune cells that are responsible for attacking foreign cells cannot destroy certain bacterial species that havepolymers of D-amino acid in their outer layer.

Introduction:

The outer layer of bacteria is known as cell wall, which is made up of peptidoglycan. It is a polysaccharide of N-acetylglucosamine and N-acetylmuramic acid, which are crosslinked by tetrapeptide of L-alanine, D-glutamine, L-lysin, and D-alanine. D- and L- are the forms of molecules, known as optical isomers; they are called so because of their ability to rotate plane polarized light. L-form is more common in biological molecules than D-form.

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9. Which one of the compounds below is the major organic product obtained from the following reaction sequence, starting with ethyl acetoacetate? 요요. 1. NaOCH2CH3 CH3CH2OH 1. NaOH, H₂O 2. H3O+ 3. A OCH2CH3 2. ethyl acetoacetate ii A 3. H3O+ OH B C D E
7. Only one of the following ketones cannot be made via an acetoacetic ester synthesis. Which one is it? Ph کہ A B C D E
2. Which one is the major organic product obtained from the following reaction sequence? HO A OH 1. NaOEt, EtOH 1. LiAlH4 EtO OEt 2. H3O+ 2. H3O+ OH B OH OH C -OH HO -OH OH D E .CO₂Et

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Biochemistry: The Molecular Basis of Life

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