Cladistics is based upon evolutionary relationships which generate ___________ structures.
Fill in the blank(s) with the appropriate word(s).
Ans: Homologous
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A major problem with hotspots is humans moving in and causing
A. habitat destruction. B. increased genetic diversity. C. increased immigration among species. D. decreased introductions. E. decreased biomagnification.
In an emergency room, a patient is found to have a depressed breathing rate, and subsequently low oxygen levels in the tissues. He is put on oxygen, but his respiration rate continues to be too low, and his oxygen saturation level in his tissues also continues to be too low. Will increasing the oxygen levels that he is receiving correct his low breathing rate?
A. Yes, because normal oxygen levels in the tissues will cause his breathing rate to return to normal. B. Yes, because the increased oxygen levels in the lungs will stimulate the breathing rate to return to normal. C. No, because the oxygen will be immediately used up to the previous deficit. D. No, because the brain does not use oxygen levels to regulate breathing.
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.
Alcohols
A. at 50% or higher concentrations dissolve cell membrane lipids. B. denature proteins when in a 50-95% solution. C. are skin degerming agents. D. are used to disinfect items by soaking. E. All of these choices are correct.