Which organism is listed as a spore-forming bacterium?

Which organism is listed as a spore-forming bacterium?

• A. Bacillus cereus
• B. Listeria monocytogenes
• C. Staphylococcus aureus
• D. Escherichia coli

Answer: (A)

Spore formation is a survival strategy used by certain bacteria to endure harsh conditions. Bacillus cereus belongs to the group that forms endospores, so it is a spore-forming bacterium. The other listed organisms—Listeria monocytogenes, Staphylococcus aureus, and Escherichia coli—do not form endospores; they exist as vegetative cells and are not spore-formers. This is why Bacillus cereus stands out as the spore-forming organism among the options.

Spore formation is a survival strategy used by certain bacteria to endure harsh conditions. Bacillus cereus belongs to the group that forms endospores, so it is a spore-forming bacterium. The other listed organisms—Listeria monocytogenes, Staphylococcus aureus, and Escherichia coli—do not form endospores; they exist as vegetative cells and are not spore-formers. This is why Bacillus cereus stands out as the spore-forming organism among the options.