Viruses Cannot Reproduce on Their Own; They Do So by Taking

question 73

Multiple Choice

Viruses cannot reproduce on their own; they do so by taking over the machinery that exists in the cells of the organisms they invade,whether those organisms are bacteria,plants,or animals.Vaccinations can provide lifelong protection against some diseases,but flu vaccines are rarely effective against the next year's flu virus.Which of the following statements is most likely to explain this fact?

• A) Viruses are not alive.
• B) Viruses can evolve quickly.
• C) A virus can change its cell membranes to block the action of the vaccine.
• D) Viruses can develop into immune bacteria that neutralize the action of the vaccine.

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