Which theory of water transport states that hydrogen bonding allows water molecules to maintain a continuous fluid
column as water is pulled from roots to leaves?
a. pressure flow
b. evaporation
c. cohesion-tension
d. abscission
e. fusion
ANSWER: c
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In addition to being used in the making of ATP, proton motive force is used directly to power the rotation of bacterial flagella.
Answer the following statement true (T) or false (F)
You are asked to determine whether an unknown tissue specimen comes from a plant or an animal
Closer inspection with an electron microscope reveals that the cells are connected by small openings lined by extensions of the cell membrane and containing tubules connecting the endomembrane systems of adjacent cells. Which of the following conclusions can be drawn from your observations? A. The openings are plasmodesmata, so the tissue must come from a plant. B. The openings are plasmodesmata, so the tissue must come from an animal. C. The openings are gap junctions, so the tissue must come from a plant. D. The openings are gap junctions, so the tissue must come from an animal. E. The openings could be either gap junctions or plasmodesmata, so it cannot be determined whether the tissue came from a plant or an animal.
In a molecule of DNA, purine bases form ________ bonds with pyrimidine bases.
A) phosphate B) hydrogen C) disulfide D) covalent
Which of the following is an example of Müllerian mimicry?
A) walking sticks that resemble twigs B) stinkbugs that produce a noxious odor C) flounders whose colors resemble the sea floor D) wasps with black and yellow bands