In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I, II and III
B. Photosystem II
C. Photosystem III
D. Photosystem I
E. Photosystem I and II
Answer: E
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When an enveloped virus adsorbs to the host cell with its protein spikes, the virions are taken into the cell by the process of
A. penetration. B. production. C. fusion. D. endocytosis.
Which threat to biodiversity isn't directly due to humans?
A) loss of habitat due to volcanic activity B) introduction of nonnative species C) overexploitation D) pollution
The energy that a parent puts into the growth, feeding, and care of offspring is called:
a. reproductive investment. b. the mating system. c. reproductive success. d. kin selection. e. total reproductive output.
How should petri plates be labelled and incubated?
A) Labelled on the bottom, incubated upside-down B) Labelled on the bottom, incubated right-side up C) Labelled on the lid, incubated right-side up D) Labelled on the lid, incubated upside-down