Which mechanism allows certain viral pathogens to evade the vertebrate immune system?  

A.  becoming a symbiont
B.  becoming nonvirulent
C.  frequent changing of surface antigens
D.  becoming metabolically inactive
E.  becoming a spore


C.  frequent changing of surface antigens

Biology & Microbiology

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Which of the following did Gregor Mendel never see?

a) a chromosome b) a stamen c) an F2 generation d) a pea e) a hybrid

Biology & Microbiology

During the Carboniferous period, photosynthesis in immense swamp forests removed ________ from the atmosphere, which produced a drier, cooler global climate and promoted the success of ________

A) oxygen; ferns B) oxygen; seed plants C) carbon dioxide; lycophytes D) carbon dioxide; seed plants

Biology & Microbiology

When one gene is able to modify the effect of a second gene, the phenomenon is known as:

A. simple dominance B. epistasis C. recessiveness D. independent assortment E. segregation

Biology & Microbiology

The process by which a single primary RNA transcript is used to make multiple proteins is called:

A. combinatorial control. B. alternative splicing. C. regulatory splicing. D. translational control. E. polymeration control.

Biology & Microbiology