The electrons excited by sunlight in photosystem I are replaced by ________, and the electrons excited by sunlight in photosystem II are replaced by ________
A) electrons from water; electrons from water
B) electrons from water; electrons from photosystem I
C) electrons from water; electrons from carbon dioxide
D) electrons from photosystem II; electrons from water
E) electrons from carbon dioxide; electrons from water
Answer: D
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The fruits of legumes:
A. are fleshy and sweet and are dispersed by birds B. are winged and dispersed by wind C. split down both sides and the seeds fall out D. have corky hulls that make them buoyant and are dispersed by water E. have hooks that cling to mammals and are dispersed by them
Which of the following describe source-sink metapopulations?
_____ Sink populations near source populations are less likely to go extinct. _____ Sink populations without access to immigrants from source populations are less likely to go extinct. _____ Source populations usually occupy better habitats. _____ Source populations are less likely to go extinct. _____ The emigration rate from source populations exceeds that from sink populations.
What do the bands on a restriction map show?
A.) the genes being expressed B.) DNA sequences C.) locations of damaged genes D.) sizes of DNA fragments
There are three dietary monosaccharides. Glucose is one- what are the other two?
a) fat and cholesterol b) lactic acid and ethyl alcohol c) fructose and sucrose d) NADH and FADH2