Two separate photosystems involved in electron flow is a hallmark of
A) anoxygenic phototrophs.
B) green sulfur bacteria.
C) oxygenic phototrophs.
D) purple bacteria.
Answer: C
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Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time. II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is. III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms. A) I B) II C) III D) I, II, and III
The major function(s) of the TCA cycle is(are)
A. energy production. B. electron transport. C. provision of carbon skeletons for biosynthesis of cell components. D. energy production and provision of carbon skeletons for biosynthesis of cell components.
How long ago did the hominin lineage, the human branch of the evolutionary tree of life, split away from other primate groups?
A. About 60 million years ago B. About 600 thousand years ago C. About 6 million years ago D. About 6 thousand years ago
Actinopterygians have thicker fins than other fish, since their fins are used as hydrofoils
a. true b. false