The bacterium that causes botulism disease is harmless until it:
1) is infected by lytic bacteria.
2) is infected by certain retroviruses.
3) contains a certain prophage DNA.
4) is irradiated by UV radiation.
5) is infected by prions.



Answer :

Final answer:

Botulism disease becomes harmful due to certain prophage DNA, resulting in severe symptoms like paralysis, with proper sterilization procedures contributing to decreased incidence.


Explanation:

The bacterium that causes botulism disease becomes harmful when it contains a certain prophage DNA. The prophage carries toxin genes that enhance the virulence of the host bacterium when expressed, leading to symptoms like paralysis. Proper sterilization procedures in food preservation have helped reduce the incidence of botulism.


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