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单选题

The word corona in Latin means________.

A. spiked
B. jagged
C. crown
D. protein

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单选题

Although there are hundreds of coronaviruses, only ________currently infect humans.

A. ten
B. seven
C. five
D. four

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单选题

Why do we need a new flu vaccine every year?

A. Influenza mutates quickly and new strains result
B. Our bodies rid themselves of the vaccine yearly
C. When it gets warm outside, vaccines do not work anymore
D. Cooler temps often cause vaccines to mutate and not be effective

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单选题

Corona viruses are a bit different from other RNA viruses. How?

A. They are quite large with many genes.
B. They are usually much more stable.
C. They often have a faster mutation rate.
D. A and B are both answers.

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多选题

What is it about RNA viruses that makes them more successful than DNA viruses?

A. Smaller and fewer genes.
B. Infect many hosts.
C. Replicates quickly.
D. More likely to mutate.

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