Certified Professional Food Safety (CP-FS) Practice Exam

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What is the required environment for anaerobic bacteria to grow?

Oxygen-rich environment
Oxygenated water
Low-oxygen or oxygen-free environment
Moderate oxygen levels

The correct answer is: Low-oxygen or oxygen-free environment

Anaerobic bacteria thrive in environments where oxygen is absent or significantly reduced. This is because these types of bacteria do not require oxygen for their metabolic processes and, in many cases, can be harmed or even killed by its presence. They are adapted to survive in low-oxygen or oxygen-free conditions, utilizing alternative pathways for growth and energy production. In contrast, environments that are rich in oxygen or contain moderate levels of oxygen are unsuitable for anaerobic bacteria. Such conditions favor the growth of aerobic bacteria, which rely on oxygen to carry out cellular respiration effectively. Therefore, the requirement for anaerobic bacteria to flourish is solely dependent on a low-oxygen or oxygen-free setting, making this the correct characterization of their growth environment.