What mutational event can cause a new species to arise nearly instantaneously?
a. extinction
b. genetic isolation
c. adaptive radiation
d. development of polyploidy
Ans: d. development of polyploidy
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During translation, translocation refers to
A. releasing a tRNA molecule from the ribosome. B. joining an amino acid to a tRNA molecule. C. joining an amino acid to the next amino acid in the chain. D. joining a tRNA molecule to the ribosome. E. moving the ribosome along the mRNA molecule.
Why is photorespiration more likely in warm weather?
a. Plants require warm weather (at least 23?C) to drive photosynthesis. b. Plants are more likely to close their stomata in the daytime heat than at night when it is cool. c. Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water; this prevents CO2 from entering the leaf. d. The rubisco enzyme is very temperature sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2. e. Plants use up the water in their central vacuoles in warm weather inhibiting the waterrequiring light reactions; this in turn alters the activity of rubisco.
How does carbon-14 dating work?
What will be an ideal response?
Although they lived at different times, all of the following people performed experiments related to how life originated. The strongest support for biogenesis came from
A. Miller. B. Fox. C. Pasteur. D. Needham.