A bacterium requiring normal atmospheric oxygen concentration to survive is called:

A bacterium requiring normal atmospheric oxygen concentration to survive is called:

• A. Normal
• B. Anaerobic
• C. Aerobic
• D. Microaerophilic

Answer: (C)

Organisms that require oxygen for growth use oxygen in their metabolism and cannot thrive in oxygen-free environments. This makes them aerobic. They rely on aerobic respiration and typically cope with reactive oxygen species using enzymes like catalase and superoxide dismutase, which helps them survive in normal atmospheric oxygen levels (about 20% O2). That’s why the term aerobic is the best fit for a bacterium that needs normal air for survival. In contrast, anaerobic organisms do not require oxygen and may be harmed by it, microaerophilic organisms prefer lower-than-atmospheric oxygen, and the word “normal” isn’t a specific biological category.

Organisms that require oxygen for growth use oxygen in their metabolism and cannot thrive in oxygen-free environments. This makes them aerobic. They rely on aerobic respiration and typically cope with reactive oxygen species using enzymes like catalase and superoxide dismutase, which helps them survive in normal atmospheric oxygen levels (about 20% O2). That’s why the term aerobic is the best fit for a bacterium that needs normal air for survival. In contrast, anaerobic organisms do not require oxygen and may be harmed by it, microaerophilic organisms prefer lower-than-atmospheric oxygen, and the word “normal” isn’t a specific biological category.