The movement of oxygen through the aquatic plant may depend on
A. aerenchyma tissue.
B. differences in the water potential of different tissues.
C. negative pressures created by transpiration.
D. aquaporins.
E. osmotic absorption by the roots.
Answer: A
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A) a tree B) a mushroom C) bacteria growing on decomposing matter D) an earthworm E) a person
Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a/n ________ cell culture.
A. primary B. initial C. secondary D. positive E. continuous
Vampire bats:
a. exhibit reciprocal altruism but not kin selection. b. are unusual in that they are one of the few animal species that exhibits kin selection. c. will sometimes regurgitate blood into the mouth of another bat that is close to starving, but the likelihood of the bat doing this is a function of the degree of relatedness between the two individuals. d. There are no such things as vampire bats; they're from a Dracula novel. e. will sometimes regurgitate blood into the mouth of an unrelated bat that is close to starving.
Approximately ________ million years ago the amniotes branched off from their amphibian ancestor
a. 300 b. 250 c. 355 d. 180 e. 425