Which theory explains how 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
c
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Binary fission ____
a. is thought to have evolved from mitosis b. is involved in gamete formation c. results in the production of two identical daughter cells d. requires spindle formation e. is important for eukaryotic cell growth
All of the following bones are part of the appendicular skeleton except the ________
a. pelvic girdle b. humerus c. tibia d. vertebral column
Choanoflagellates have been important for the study of cell communication evolution because choanoflagellates have:a
protein kinases similar to those in animals. b. G proteins different from those in prokaryotes. c. signaling molecules similar to those of other protists. d. signal transduction pathways unlike those in other bacteria. e. signal transduction pathways that interfere with the cells they infect.
What is the primary reason that a hot spring will kill a fish placed in it but encourage the growth of certain bacteria?
A) The high temperatures destroy most of the fish's enzymes, but the specialized bacteria have enzymes adapted to these temperatures. B) Fish cannot feed directly on bacteria, but the bacteria can feed on dead fish. C) At hot spring temperatures, the metabolic activity of the fish's cells is so rapid that it runs out of food reserves and dies; the bacteria feed on the dead fish. D) Bacterial growth at high temperatures is so rapid that it deoxygenates the water and kills the fish.