A phenomenon in which sensations become less noticeable with prolonged exposure is called
A. gradient adaptation.
B. an action potential.
C. a graded potential.
D. radiating adaptation.
E. sensory adaptation.
E. sensory adaptation.
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Which of the following is true?
A) Mutations that inactivate tumor suppressor genes are important in cancer. B) Cancer is a single disease with one underlying molecular cause. C) Uncontrolled cell growth alone is sufficient for the development of cancers. D) Cancer is a single disease resulting from a common set of mutations.
What are the openings in the periderm of some plants called?
a. stomata b. fistulae c. lenticels d. gonopores
Dark clay soils that show significant expansion and contraction due to wetting and drying are referred to as
A) mollisols. B) vertisols. C) spodosols. D) andisols.
Which of the following statements about a resting transmembrane potential is true?
a. If the sodium-potassium pump were blocked, the transmembrane potential would become greater. b. If the resting neuron were suddenly made permeable to positive ions, a transmembrane potential would not form. c. If the resting neuron had no voltage-activated K+ channels, K+ concentrations in cytoplasm would increase. d. If the voltage-activated Na+ channels are blocked, Na+ will not enter the cytoplasm of the neuron. e. If the cytosol developed a negative charge, the resting potential would disappear..