Which type of plant hormone has been shown to both promote pollen tube elongation and inhibit root
elongation?
a. jasmonates
b. ethylene
c. brassinosteroids
d. salicylic acid
e. oligosaccharins
C
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As DNA polymerase synthesizes a new DNA strand, it can ____
a. detect an incorrect nucleotide b. not detect an incorrect nucleotide c. induce apoptosis when it detects a mistake in DNA synthesis d. induce senescence when it detects a mistake in DNA synthesis e. immediately stop the cell cycle
At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than b. about the same as c. higher than d. exactly the same as e. less negative than
Salamanders belong to which of the following lineages?
a. Caudata b. Aves c. Squamata d. Gymnophiona e. Anura
Using the data from the graphs and what you know about membranes and metabolic pathways, predict which of the following is the likely reason why actions of aquaporins in a membrane can change so rapidly
A) The number of aquaporins in the membrane is constant, but the pores have to be activated. B) Aquaporins are inserted into the membrane as needed. C) Aquaporins are only in cells that need to be permeable to water. D) Aquaporins use ATP to pump water across the membrane, and their action is limited by the metabolic pathways that produce ATP.