isaadel2017 isaadel2017

09-05-2021
Biology

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Polio viruses contain DNA. The viruses in the polio vaccine have DNA in which the base sequence has several differences from the base sequence in the normal polio virus. Suggest how this makes them unable to reproduce in the human body.

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09-05-2021

Answer:

The polio strains cannot reproduce because they are weakened.

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