During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done? 

A. To hide from the host's immune system.
B. To signal endocytosis of the parasites.
C. VSG genes inhibit phagocytosis.
D. VSG genes activate photoheterotrophy.


A. To hide from the host's immune system.

Biology & Microbiology

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Early in the infection with HIV, most virions bind to the host cell using CCR5 as a coreceptor. As the infection progresses, the HIV population evolves to use an alternate coreceptor. What is the alternate coreceptor these X4 viruses utilize?

A) Tetherin B) CCR5? C) vpu D) TRIM5? E) CXCR4

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In what ways can riboswitches function?

What will be an ideal response?

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Which health screening activity is most important for girls and women with Turner syndrome?

A. Mammography B. Test for osteoarthritis C. Blood pressure screening D. Pulmonary function testing

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