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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 20, Problem 13SQ
Textbook Problem
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A bacterial exotoxin is a _______ .

  1. a. membrane lipid
  2. b. membrane protein
  3. c. secreted protein
  4. d. cell wall component

Summary Introduction

Introduction: Bacterial exotoxins are the harmful proteins that are secreted by the bacteria.

In contrast to the endotoxins, the exotoxins are released to the environment either actively or during cell lysis. They are heat liable proteins and are extremely toxic to the affected cells even in smaller amounts.

Explanation of Solution

Reason for the correct answer: The bacterial exotoxins are the secretory proteins released by bacteria that have a lethal effect on other organisms.

Option c. is given as, “secreted protein”. The lethal proteins secreted by the bacteria are called as bacterial exotoxins.

Hence the correct answer is option c.

Reason for the incorrect answer:

Option a. is given as “membrane lipid”. Exotoxins are not associated with the membrane lipids. The membrane lipids are the compounds that make up double layer (lipid bilayer) around the cell.

Hence the correct answer is option a...

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