Multiple Choice
Which of the following characteristics would most likely rule out Pseudomonas as the identity of an unknown bacterial isolate?
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1. Introduction to Microbiology
Members of the Bacterial World
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Which of the following is a bacterial defense mechanism against viruses?
A
CRISPR-Cas system
B
Conjugation
C
Endospore formation
D
Restriction-modification system
Verified step by step guidance1
Understand that bacteria have evolved several defense mechanisms to protect themselves from viral infections, particularly from bacteriophages (viruses that infect bacteria).
Identify the CRISPR-Cas system as an adaptive immune mechanism in bacteria that captures snippets of viral DNA and uses them to recognize and destroy the virus during future infections.
Recognize the restriction-modification system as another bacterial defense, where bacteria produce restriction enzymes that cut foreign viral DNA at specific sequences, while protecting their own DNA by methylation.
Note that conjugation is a process of horizontal gene transfer between bacteria and is not a defense mechanism against viruses.
Understand that endospore formation is a survival strategy for bacteria under harsh conditions, not specifically a viral defense mechanism.
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