Which portion of the photosynthetic apparatus absorbs light?
A. photosystem I
B. photosystem II
C. NADP reductase
D. both photosystem I and photosystem II
E. both photosystem I and NADP reductase
D. both photosystem I and photosystem II
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A virus that kills its host is said to be
A) lytic or virulent. B) temperate. C) lysogenic. D) virulent or lysogenic, but not temperate.
Which of the following is true during a typical cAMP-type signal transduction event?
A) The second messenger is the last part of the system to be activated. B) The hormone activates the second messenger by directly binding to it. C) The second messenger amplifies the hormonal response by attracting more hormones to the cell being affected. D) Adenylyl cyclase is activated after the hormone binds to the cell and before phosphorylation of proteins occurs.
The change in one population driven by a change in an associated population is called
A) assortative evolution. B) genetic drift. C) coevolution. D) random mutation. E) fitness.
Genotypic sex determination does not in ________
A) mammals B) round worms C) reptiles D) flies E) birds