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.
Explanation of Solution
Aerobes and anaerobes (facultative or strict) both perform
The differences between strict aerobes, strict anaerobes, and facultative anaerobes are as follows:
S. No. | Characteristics | Strict aerobes | Strict anaerobes | Facultative anaerobes |
1. | Oxygen requirement | The 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 acceptor | They 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. | Examples | Pseudomonas aeruginosa and Mycobacterium tuberculosis. | Clostridium, and Propionibacterium | Escherichia coli, Salmonella, and Staphylococcus aureus. |
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Chapter 41 Solutions
Prescott's Microbiology
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