Neurotransmitters may be removed from the synaptic cleft by:
a. enzymatic breakdown or pumping back into presynaptic cells
b. enzymatic breakdown only
c. pumping back into presynaptic cells only
d. neutralization by antibodies
e. ionic degradation
a
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What does the graph in the figure above tell you about the definition of a keystone species?
A) A keystone species has little interaction with other species in an environment. B) Removing a keystone species from the community drastically reduces diversity. C) Adding a keystone species to the community will make it more diverse. D) Removing a keystone species from the community will eventually allow for the invasion of a new species.
When toxic chemicals enter the environment, there is a good chance that they will fid their way into food chains and
food webs. Such was the case with DDT, a chemical that was used to control mosquitoes before it was banned in 1972. The processes that proved DDT to be so dangerous could be manifested in other substances like heavy metals, other pesticides and radioactive isotopes. Use the example of DDT to explain why these chemicals can have such far-reaching effects, making sure you use the terms bioaccumulation, persistence, and biological magnification. What will be an ideal response?
What plant secondary metabolite was isolated from the Cinchona tree to fight malaria?
A. taxol B. penicillin C. digitalis D. acacia E. quinine
A physician diagnoses a patient with lepromatous Hansen's disease. All of the following pertain to the patient EXCEPT
A) disfiguring nodules form all over the body. B) the disease has progressed from the tuberculoid stage. C) a skin biopsy will be taken to aid diagnosis. D) treatment will include injections of penicillin. E) infection probably occurred as a result of prolonged contact with another infected individual.