Food Manager Practice Exam

Which bacteria can form spores and does not require oxygen to grow?

1. Salmonella

2. Chlostridium botulinum

3. Listeria monocytogenes

4. Campylobacter jejuni

The correct answer is: Chlostridium botulinum

Clostridium botulinum is the correct choice because it is a type of bacteria known for its ability to form spores, a survival mechanism that allows it to withstand harsh environmental conditions. This characteristic is crucial as spore-forming bacteria can remain dormant until conditions are favorable for growth, which includes the food supply. Clostridium botulinum is also classified as an anaerobic bacterium, meaning it does not require oxygen to grow, and in fact, its growth is promoted in low-oxygen environments, such as improperly canned or preserved foods. The other bacteria listed do not possess both of these characteristics. Salmonella is a non-spore-forming organism that requires oxygen for growth. Listeria monocytogenes is also non-spore-forming, though it can grow in the presence of oxygen and is known for its ability to thrive at refrigeration temperatures. Campylobacter jejuni, similarly, is not a spore-former and prefers microaerophilic conditions, requiring reduced oxygen levels to grow. Thus, the unique traits of Clostridium botulinum make it stand out as the only spore-forming, anaerobic bacterium in this list.