What is one of the independent variables in the peacock butterfly experiment?
A. Presence of the wing spot
B. Range of migration
C. Species of bird predator
D. Experimental location
E. Percentage of survivors
Answer: A
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Pyrrhocoris apterus, or firebug, is native to Europe and China, and eats the seeds of lime trees and mallow trees
What is the most likely explanation for the fact that a native North American species, the fir tree, synthesizes a compound that disrupts development of this European insect? A. The fir tree benefits from this compound because its effect on the firebug decreases competition for resources in its natural environment. B. The fir tree benefits from this compound because its effect on the firebug increases the survival of fir tree offspring. C. The fir tree benefits from this compound because its effect on the firebug increases predation pressure on its competition. D. The fir tree benefits from this compound because its effect on the firebug increases the survival of other, related members of the same species. E. There is likely strong similarity in the hormone receptors of different insects so that a compound made by a tree native to North America has an effect on an insect native to Europe.
In RNAi, imperfect pairing of miRNA to target mRNA results in ____ while perfect pairing of miRNA to target
mRNA causes ____.
a. blocking transcription of the target mRNA; mRNA degradation b. blocking translation of the target mRNA; mRNA degradation c. recruitment of siRNA; blocking translation of the target mRNA d. mRNA degradation; recruitment of siRNA e. blocking transcription of the target mRNA; blocking translation of the target mRNA
Approximately what percentage of a cell's genes is being used at any one time?
a. 1 to 2 percent b. 5 to 10 percent c. 25 to 50 percent d. 70 to 80 percent e. 90 to 99 percent
In a non-dividing cell, what part of the life
cycle is it in?
a. G1 b. S c. G2 d. prophase e. more than one of these