Textbook Question
Microaerophiles that grow best with a high concentration of carbon dioxide in addition to a low level of oxygen are called:
a. Aerotolerant
b. Capnophiles
c. Facultative anaerobes
d. Fastidious
958
views
10. Dynamics of Microbial Growth
Oxygen Requirements for Microbial Growth
Multiple Choice
Acne-associated bacteria (e.g., Cutibacterium acnes) are anaerobic; which statement best describes what this means regarding oxygen?
A
They grow equally well with or without oxygen (O₂).
B
They require high levels of oxygen (O₂) and grow best under increased oxygen tension.
C
They require oxygen (O₂) for growth and cannot grow without it.
D
They can grow only in the absence of oxygen (O₂).
Verified step by step guidance1
Understand the definition of anaerobic bacteria: These bacteria do not require oxygen (O₂) for growth and may even be harmed by its presence.
Compare the given options with the definition:
- 'Grow equally well with or without oxygen' describes facultative anaerobes.
- 'Require high levels of oxygen' describes obligate aerobes.
- 'Require oxygen for growth' also describes obligate aerobes.
Recognize that Cutibacterium acnes is an obligate anaerobe, meaning it can only grow in environments lacking oxygen.
Conclude that the correct statement is the one indicating growth only in the absence of oxygen.
Summarize that anaerobic bacteria like Cutibacterium acnes thrive in oxygen-free environments and are inhibited or killed by oxygen.
Related Videos
Related Practice
