Discussion
Which among the following acts as receptors for bacteriophage attachment in Gram-negative bacteria?
Answer: B
Correct answer: O antigens
The O-antigen of lipopolysaccharide is the most exposed structure on a gram-negative cell, and many bacteriophages use it as the receptor they recognise before injecting their DNA. Lipid A is buried in the membrane, and teichoic acid belongs to gram-positive walls - where it serves the same purpose for their phages.
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