Which population has a small percentage of Denisovan genes, thus suggesting interbreeding?
a. Asians
b. Melanesians
c. H. floresiensis
d. Neanderthals
e. chimpanzees
b
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Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi)
A) paralysis of muscle tissue B) gradual loss of resting potential C) convulsions due to constant muscle stimulation D) decrease in the frequency of action potentials E) no effect
Suspect spore-forming, gram-positive Bacillus species that is c-hemolytic, nonmotile, and penicillin-susceptible and that produces a wide zone of lecithinase on egg yolk agar can be iden-tified as:
a. Corynebacterium diphtheria. b. B. anthracis. c. Bacillus cereus. d. Corynebacterium jeikeium.
Prader-Willi and Angelman syndromes both arise from the same area of chromosome 15, illustrating
A) epistasis. B) X inactivation. C) genomic imprinting. D) behavior modification.
Approximately what percent of the human genome codes for protein?
A) 75 percent B) 12 percent C) less than 2 percent D) 21 percent E) 97 percent