Bacterial Cell Wall Structure
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Bacterial Cell Wall Structure

This quiz covers the components of the bacterial cell wall, including the peptidoglycan layer, lipoprotein, and outer membrane.

Created by
@LucidJadeite6707

Questions and Answers

What is the primary function of the outer membrane in Gram-negative bacteria?

To act as a site for the attachment of O antigen and endotoxin

What is the main component of the inner leaflet of the outer membrane?

Phospholipid

What is the role of teichoic acid in Gram-positive bacteria?

It is the major surface antigen

What is the function of the cytoplasmic membrane in terms of respiration?

<p>It is responsible for electron transport and oxidative phosphorylation</p> Signup and view all the answers

What is the role of the cell wall in maintaining the shape of bacteria?

<p>It provides structural support to the cell</p> Signup and view all the answers

What is the function of the cell wall in relation to antibiotics?

<p>It is the site of action for many antibiotics</p> Signup and view all the answers

What is the composition of the outer membrane in Gram-negative bacteria?

<p>An asymmetrical bilayer with phospholipid and lipopolysaccharide</p> Signup and view all the answers

What is the function of the cell wall in relation to bacterial viruses?

<p>It contains receptors for bacterial viruses</p> Signup and view all the answers

What is the main function of the capsule in bacteria?

<p>To protect bacteria against phagocytosis and antibacterial agents</p> Signup and view all the answers

What is the composition of the capsular substance in streptococci?

<p>A protein</p> Signup and view all the answers

How is the capsule demonstrated in a bacterial suspension?

<p>By staining with india ink</p> Signup and view all the answers

What is the percentage of water in the bacterial cytoplasm?

<p>80%</p> Signup and view all the answers

What is the shape of the bacterial nucleoid?

<p>A closed circular thread</p> Signup and view all the answers

What is the function of the ribosome in bacteria?

<p>To synthesize proteins</p> Signup and view all the answers

What is the characteristic of a plasmid?

<p>It is a small circular DNA</p> Signup and view all the answers

What is the characteristic of inclusions in bacteria?

<p>They are not essential or permanent structures</p> Signup and view all the answers

What is the primary component of Gram-positive bacterial cell walls?

<p>Peptidoglycan</p> Signup and view all the answers

What is attached to the N-acetyl muramic acid subunit in peptidoglycan?

<p>Tetra-peptide chains</p> Signup and view all the answers

What is the function of pentapeptide bridges in peptidoglycan?

<p>To cross-link tetra-peptide chains</p> Signup and view all the answers

What is the percentage of peptidoglycan in Gram-negative bacterial cell walls?

<p>5-10%</p> Signup and view all the answers

What is the composition of peptidoglycan?

<p>N-acetyl muramic acid and N-acetyl glucosamine</p> Signup and view all the answers

What is the role of cross-linking in peptidoglycan?

<p>To achieve the rigidity of the bacterial cell wall</p> Signup and view all the answers

What is the difference between Gram-positive and Gram-negative bacterial cell walls?

<p>Gram-positive cell walls have a thicker peptidoglycan layer</p> Signup and view all the answers

What is the component of the Gram-negative cell wall that is not present in Gram-positive cell walls?

<p>Outer membrane</p> Signup and view all the answers

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