The movement of genetic material from one clade to another is called
a. gene substitution.
b. polyphyly.
c. hybridization.
d. cloning.
e. horizontal gene transfer.
E
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NADP+ gets its electrons to become NADPH
in the light-dependent reactions of photosynthesis from
a. ATP synthase b. the flow of hydrogen ions c. electron transfer chains d. oxygen gas e. glucose
The biological species concept
1.defines a species as a group that can interbreed and produce fertile offspring. 2.applies to asexually reproducing organisms. 3.looks at visible traits. 4.emphasizes evolutionary relationships. 5.was used by Carolus Linneaus.
Characterize the types of symbioses involved in the ant-wasp-aphid-buchnera-secondary symbiont system. Which pairs of species interactions do you think represent symbioses? Which pairs of interactions do you think are too weak or distant to be considered symbioses?
What will be an ideal response?
It is difficult to estimate current rates of extinction, but we know that extinction rates have risen dramatically in recent years because
A) the fossil record is unreliable. B) current rates of extinction are much higher than that of background rates. C) new species are evolving as fast as species are becoming extinct. D) background extinction rates have increased. E) most species in danger of extinction are microscopic.