A neuron that engages in spatial summation acquires a mutation that causes dendrite overgrowth and promiscuous synapsing. What is the likely outcome?
A. Abnormally low frequency of action potentials
B. Summation will not occur
C. Action potentials with stronger depolarization
D. Abnormally high frequency of action potentials
Answer: D
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The best terms for a fish whose body temperature varied between 4oC during the day when it is in deep, cold ocean waters and 26oC during the night when it comes to the surface to feed would be
A. endothermic and homeothermic. B. endothermic and heterothermic. C. ectothermic and homeothermic. D. ectothermic and heterothermic. E. ectothermic and endothermic.
Arrange the structures that control cardiac output in the correct order
a. baroreceptors ? brain stem ? autonomic nervous system ? heart b. baroreceptors ? heart ? brain stem ? autonomic nervous system c. brain stem ? baroreceptors ? autonomic nervous system ? heart d. autonomic nervous system ? brain stem ? heart ? baroreceptors e. heart ? baroreceptors ? autonomic nervous system ? brain stem
Promoter sequences in which region relative to the initiation site of a gene are adequate to initiate eukaryotic transcription by RNA polymerase I?
a. -10 and -80 b. -25 and -35 c. -45 and +20 d. -180 and -105
Bacterial ribosomes are composed of several polypeptides and
A) three RNA molecules in two subunits. B) three RNA molecules in three subunits. C) two RNA molecules in two subunits. D) two RNA molecules in a single complex. E) one large RNA molecule in a single complex.