What hormone promotes apical dominance in plants?
a. abscisic acid
b. auxin
c. cytokinin
d. ethylene
e. gibberellin
b
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What percentage of trash in the United States is recycled?
a. 10 percent b. 25 percent c. 33 percent d. 50 percent e. 75 percent
Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these
Which is the largest division of the geologic time scale?
a. eon b. era c. epoch d. period e. millennium
Caenorhabditis elegans is a nematode. During its development, it produces more than 1000 cells. However, the adult worm has only 959 somatic cells. The process by which 131 cells are specifically targeted for destruction is called______________
(a) directed cell pruning. (b) programmed cell death. (c) autophagy. (d) necrosis.