One Ml of a Liquid Suspension of Bacteriophage Is Mixed

question 31

Multiple Choice

One ml of a liquid suspension of bacteriophage is mixed with its host bacteria and plated. After incubation, the plate is completely clear. What is the probable explanation?

• A) The bacteria mutated and could no longer be infected by this phage.
• B) The bacteriophage doesn't grow on the type of agar used.
• C) The bacteriophage culture was dead.
• D) The phage concentration was so high that all the host bacterial cells were killed.
• E) The phage concentration was too low to infect many bacterial cells.

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