The stomata
a. open at night in most plants.
b. are open when the guard cells are swollen
with water.
c. close when water moves into the guard
cells.
d. are covered by the cuticle to reduce water
loss.
e. fit all of these descriptions
B
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The extent and duration of cellular response to a signal depend on:
A. the binding affinity of the receptor to the signaling molecule. B. the concentration of the signaling molecule in the vicinity of the receptor. C. the level of expression of the signaltransduction proteins. D. the level of expression of the terminating proteins. E. All of these choices are correct.
The placenta
a. forms from endometrial and extraembryonic tissues. b. will cover about one-fourth of the inner uterine surface at full term. c. does not normally intermingle fetal blood with maternal blood. d. secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. e. does all of these.
Humans and many other species rely on soil resources for survival. Which of these human actions is least likely to result in depletion or damage of soil resources?
a) introduction of species into new habitats b) removal of forest trees due to logging c) burning of fossil fuels d) overgrazing and agriculture
ionic bond
What will be an ideal response?