The principal government agency responsible for keeping track of infectious diseases is
a. Environmental Protection Agency(EPA)
b. Center for Disease Control(CDC)
c. Food and Drug Adminstration (FDA)
d. None of the above
Ans: b. Center for Disease Control(CDC)
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Activator proteins in prokaryotes experience shape changes in the presence or absence of small molecules. As a consequence: (Select all correct choices)
A. they may activate genes needed only when such a small molecule is present in the cell. B. they may activate genes necessary to synthesize a specific small molecule. C. they are unable to act alone.
Animals that see only black and white have predominantly what type of photoreceptors?
a. rod cells b. cone cells c. dendrites d. photo discs
Which antibodies are secreted when an allergic person is exposed to an allergen?
a. IgA b. IgD c. IgE d. IgG e. IgM
The storage form of carbohydrates is ________ in animals and ________ in plants
A) starch; glycogen B) glycogen; starch C) cellulose; glycogen D) glycogen; cellulose