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
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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
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.
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
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