Which group of bacteria is known for containing organisms that are predators on other bacteria?

• A. Streptococcus
• B. Bdellovibrio
• C. Cyanobacteria
• D. Lactobacillus

Answer: (B)

Verified step by step guidance

1. Understand the question is asking about a group of bacteria known for preying on other bacteria, which means these bacteria actively hunt and consume other bacterial cells.
2. Recall that Streptococcus and Lactobacillus are generally known as beneficial or commensal bacteria, often involved in fermentation or human microbiota, but not predators.
3. Recognize that Cyanobacteria are photosynthetic bacteria, primarily known for producing oxygen through photosynthesis, not for predation.
4. Identify Bdellovibrio as a genus of predatory bacteria that invade and consume other Gram-negative bacteria, making them unique predators in the bacterial world.
5. Conclude that the group known for containing predatory bacteria is Bdellovibrio, based on their ecological role and behavior.