PRESCOTT'S MICROBILOGY
PRESCOTT'S MICROBILOGY
11th Edition
ISBN: 9781264075515
Author: WILLEY
Publisher: MCG
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Chapter 41, Problem 1RC
Summary Introduction

To determine: The similarities and differences between strict aerobes, strict anaerobes, and facultative anaerobes.

Introduction: Micro-organisms can be classified into various categories based on the requirement of oxygen for their survival. These categories are strict (obligate) aerobes, strict (obligate) anaerobes, facultative anaerobes, aerotolerant anaerobes, and microaerophiles.

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Explanation of Solution

Aerobes and anaerobes (facultative or strict) both perform cellular respiration and utilize glucose as a substrate or starting molecule to produce ATP or energy. However, the amount of ATP released by aerobic respiration is much more as compared to that of anaerobic respiration.

The differences between strict aerobes, strict anaerobes, and facultative anaerobes are as follows:

S. No.CharacteristicsStrict aerobesStrict anaerobesFacultative anaerobes
1.Oxygen requirementThe organisms that strictly require oxygen in order to grow are strict aerobes.The organisms for which oxygen is toxic, and they only grow under high reducing intensity or absence of oxygen are strict anaerobes.The organisms that can grow under both aerobic and anaerobic conditions are facultative anaerobes.
2.Terminal electron acceptorThey use molecular oxygen as a terminal electron acceptor.They use molecules such as sulfate (SO42-), nitrate (NO3-), and ferric iron (Fe3+) as terminal electron acceptors.They preferentially use molecular oxygen as terminal electron acceptors but can also use sulfate (SO42-), nitrate (NO3-).
3.ExamplesPseudomonas aeruginosa and Mycobacterium tuberculosis.Clostridium, and PropionibacteriumEscherichia coli, Salmonella, and Staphylococcus aureus.

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Chapter 41 Solutions

PRESCOTT'S MICROBILOGY

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