An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) A. aerobe. B. obligate aerobe. C. facultative anaerobe. D. microaerophile. E. obligate anaerobe.
Question
An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n)
A. aerobe. B. obligate aerobe. C. facultative anaerobe. D. microaerophile. E. obligate anaerobe.
Solution
The correct answer is A. Aerobe.
An aerobe is an organism that uses oxygen for respiration and has the enzymes to deal with toxic by-products of oxygen metabolism. They can metabolize energy in the presence of oxygen by respiration, and they possess the necessary enzymes to neutralize harmful oxygen metabolites known as reactive oxygen species.
Here's a brief explanation of the other options:
B. Obligate aerobes: These organisms not only utilize oxygen, but also require it for their survival.
C. Facultative anaerobes: These organisms can survive in both oxygen-rich and oxygen-poor environments. They can switch between aerobic respiration (when oxygen is available) and anaerobic respiration (when oxygen is not available).
D. Microaerophiles: These organisms require oxygen for growth, but at lower concentration than is present in the atmosphere. They are damaged by normal atmospheric concentrations of oxygen.
E. Obligate anaerobes: These organisms cannot tolerate oxygen and will die in its presence. They do not have the necessary enzymes to neutralize reactive oxygen species.
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