The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this?
A. Tree 1; monophyletic.
B. Tree 2; polyphyletic.
C. Tree 2; paraphyletic.
D. Tree 3; monophyletic.
E. Tree 3; polyphyletic.
E. Tree 3; polyphyletic.
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Gap junctions in cells
a. prevent fluid leakage between adjacent cells. b. are used only to stimulate cellular reproduction. c. allow ions to pass between adjacent cells. d. only occur in muscle tissue. e. do none of these.
The term that is synonymous with a motor neuron is a(n) ____ neuron
a. input b. afferent c. efferent d. ganglia e. peripheral
If gross primary production were to increase in an ecosystem, it would be reasonable to expect that
A. the trophic web would become more complex. B. nutrients would no longer be limiting factors. C. cellular respiration would decrease. D. the biomass of herbivores would increase. E. net primary production would not increase.
Rhinovirus causes the common cold in humans and its genome is protected by a
a. capsule b. peptidoglycan wall c. plasma membrane d. nucleocapsid