The most important ion in controlling the movement of water into and out of the guard cells is
A. sodium.
B. hydrogen.
C. carbon.
D. nitrogen.
E. potassium.
The hormone ABA triggers the outflux of potassium from guard cells. As the potassium exits the guard cells water follows. This results in a loss of turgor pressure and the cells cover the stomatal opening.
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You give up on the garden and ignore it for a third summer. You notice that two small birch trees sprout and begin to grow among the sunflowers
The birch trees are slower growers than the sunflowers, but by the fifth summer they start to shade the sunflowers. The birch trees and the sunflowers are in competition for: A. water. B. light. C. nutrients. D. All of the responses are correct. E. None of the responses is correct because competition only occurs between members of the same species.
The cookies with the least amount of fat had more cells around 500 ?m in size than did the cookies with the most amount of fat
Indicate whether the statement is true or false
Which of the following reactions is the result of type IV (delayed) hypersensitivity?
A) runny nose triggered by pollen B) dermatitis in response to latex gloves C) sensitivity to pet dander D) skin irritation after wearing wool E) breathing difficulties after exposure to mold spores
Mycoplasma pneumoniae causes respiratory disease by
A) infecting and killing alveolar macrophages. B) triggering inflammatory mediator release. C) attaching to and ultimately killing the ciliated epithelial cells of the trachea. D) paralyzing the respiratory muscles. E) killing the epithelial cells of the alveoli.