Increasing the flow of Na+ ions into a neuron at rest (-70 mV initially) would trigger
A. hyperpolarization.
B. depolarization.
C. repolarization.
D. active transport.
E. None of the choices are correct.
B. depolarization.
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The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result
What will be an ideal response?
Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?
A) Fluffing feathers results in less cooling by radiation because feathers emit less infrared radiation than other tissues do. B) Fluffing decreases the amount of heat lost by conduction when the bird makes contact with cold objects in its environment. C) Fluffing creates a pocket of air near the bird that acts as insulation. D) Fluffing decreases the surface-area-to-volume ratio, thus decreasing the amount of heat lost to the environment.
Which of the following statements is true regarding Drosophila?
A) The ratio of autosomes to fly Y and X chromosomes determines fly sex. B) The Y chromosome plays no role on fly sex determination but does contain genes for fly reproduction. C) The Y chromosome determines male flies. D) The Y chromosome plays no role in fly sex determination or fly reproduction. E) The ratio of X to Y chromosomes determines fly sex.
Which of the following statements about restriction nucleases is false?
(a) A reproducible set of DNA fragments will be produced every time a restriction nuclease digests a known piece of DNA. (b) Restriction nucleases recognize specific sequences on single-stranded DNA. (c) Some bacteria use restriction nucleases as protection from foreign DNA. (d) Some restriction nucleases cut in a staggered fashion, leaving short, single-stranded regions of DNA at the ends of the cut molecule.