Prescott's Microbiology
Prescott's Microbiology
11th Edition
ISBN: 9781260409062
Author: WILLEY, Joanne
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 21, Problem 1RC
Summary Introduction

To determine: The diagrammatic representation of a Gram-negative bacterial cell wall and its constituent parts.

Introduction: The plasma membrane of the bacteria is surrounded by a layer known as the cell wall. Cell wall helps in maintain the shape of the cell and also protects it from osmotic lysis. In some organism, it protects the cells from the toxic substances, whereas in some it contributes to pathogenicity. Based on gram staining, the bacteria are divided into two major categories: gram-negative (stains pink) and gram-positive bacteria (stains purple).

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Pictorial representation:

Prescott's Microbiology, Chapter 21, Problem 1RC

Fig.1: Diagrammatic representation of the cell wall of Gram-negative bacteria

The cell wall of Gram-negative bacteria consists of two different layers: 2-7 nm thick peptidoglycan layer, which is covered by a 7-8 nm thick outer membrane. There is also some space between the plasma membrane and the outer membrane known as periplasmic space and periplasm is the substance which occupies periplasmic space.

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