Terrestrial plants must maintain a balance between the need for CO2 and the need to avoid desiccation. One response to these conflicting forces is that ___________________
A. stomata close when photosynthesis
causes internal CO2 levels to drop.
B. stomata close when guard cells lose water.
C. guard cells shrink from water loss, causing
stomata to open.
D. stomata open in response to O2 buildup.
E. water is actively transported into the guard
cells, causing stomata to close.
B
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In the creation of a DNA profile, _____ are typically used
a. minisatellites b. short tandem repeats c. introns d. exons e. plasmids
"Heartburn" is caused by
a. HCl sloshing back into the esophagus. b. pepsin sloshing back into the esophagus. c. pepsinogen sloshing back into the esophagus. d. chymotrypsin sloshing back into the esophagus. e. intrinsic factor sloshing back into the esophagus.
Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have times more DNA than G1 phase cells. The cells of this group are _____
A) between the G1 and S phases in the cell cycle B) in the G2 phase of the cell cycle C) in the M phase of the cell cycle D) in the S phase of the cell cycle
Which of these events occurs first in seed germination?
A) Cell division occurs in the embryo and growth starts. B) Mitochondria multiply and provide energy for growth processes. C) Water is taken up. D) Oxygen is produced and proteins are synthesized.