A type of natural selection in which organisms with phenotypes at both extremes of the phenotypic range are favored by the environment
Answer: diversifying selection
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Among the following lineages, which has the largest number of Hox genes when all Hox gene clusters
are taken into account?
a. cnidarians b. cephalochordates c. vertebrates d. arthropods e. eurochordates
One possible reason for a "senior moment" might be
a. loss of neurotransmitter. b. demyelination of CNS neurons causing slower conduction of impulses. c. toxins building up in the brain over the years. d. slower release of neurotransmitters. e. both b and d.
While examining a rock surface, you have discovered an interesting new organism. Which of the following criteria will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya?
A) Cell walls are made primarily of peptidoglycan. B) The organism does not have nucleus. C) The lipids in its plasma membrane consist of glycerol bonded to straight-chain fatty acids. D) It can survive at a temperature over 100°C.
Animal research has revealed a general reward system related to the release of the neurotransmitter
A) acetylcholine. B) GABA. C) dopamine. D) epinephrine.