Photons from light can boost an electron to a higher energy state.
Answer the following statement true (T) or false (F)
True
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The most selectively toxic drugs are those that
A. target microbial sites that are not present in humans, e.g., the bacterial cell wall. B. cause damage to host tissues. C. cause allergic reactions in humans. D. target structures present in both microbes and humans, thus causing host tissue damage.
In a molecular-evolutionary analysis, you estimate the number of base substitutions per site (K) at 0.82. Given an estimated divergence time (T) of 10 million years based on the fossil record, what is the substitution rate (r)?
What will be an ideal response?
When macrophages send out chemical messages to the brain to warn of microbial invasion, the brain often responds by producing a ________.
Fill in the blank(s) with the appropriate word(s).
A drawback of all inactivated vaccines is that
A) they may mutate to a more virulent form. B) they are quickly cleared from the body, limiting antigen exposure. C) they are likely to cause disease in immunocompromised hosts. D) they may cause secondary transmission from the immunized person to another host. E) they require complex genetic engineering techniques to produce.