Which of the following is most responsible for the increasing challenge of protist infections?
A. Protists are not always recognized by the host immune response.
B. Protists are becoming completely resistant to the drugs used to control them.
C. Protists are mutating and gaining virulence factors.
D. The size of the susceptible population is growing as the number of patients with immunocompromising conditions is increasing.
Answer: D
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The sodium/potassium pump is an example of:
A. a symporter. B. passive transport. C. an antiporter. D. channel-mediated diffusion. E. None of these choices is correct.
Why did internal fertilization likely evolve?
A. To increase the chances of successful fertilization. B. As a response to copulation. C. Because there were no safe places to lay eggs. D. As an adaptation to life in a terrestrial environment.
The _________ is an internal support structure and can be found in organisms in the phylum echinodermata.
A. endoskeleton B. hydrostatic skeleton C. gastrovascular cavity D. exoskeleton E. vascular canal
All of the following maternal infections may cause congenital anomalies in the embryo, EXCEPT
A. Cytomegalovirus B. Herpes C. Rhinovirus D. Rubella E. Toxoplasmosis