Stomata are key sites of information processing because ____________. (Select all correct answer options.)
A. they respond to CO2 demand
B. they respond to H2O loss
C. they open in response to O2
D. they open in response to light
A,B
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Communication between cells of the immune system is accomplished in many cases through
A) allelic exclusion. B) clonal deletion. C) cytokines. D) allelic exclusion, clonal deletion, and cytokines.
Plant cells usually divide and then increase in size
A. true B. false
The alkaloids contained in the nectar of the pitcher plant serve to
a. attract insects. b. attract microbes. c. collect water. d. disable insects
Oxygen gas produced during photosynthesis orginates as
a) oxygen atoms contained in carbon dioxide are released when the carbon is fixed b) oxygen atoms are released by the metabolism of carbohydrates c) a molecule of chlorophyll oxidized by a photon d) oxygen atoms contained in water molecules e) a byproduct of nitrogen-fixing bacteria