The plasma membrane
A. uses cholesterol as its primary lipid.
B. contains cellulose.
C. has extracellular and intracellular layers or leaflets that are highly symmetrical.
D. is composed of an extracellular and intracellular layer of phospholipids.
Answer: D
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A disinfectant is used on your work surface:
before the beginning of laboratory procedures. after all work is complete. after any spill of live microorganisms. all of the above are correct.
Several new tetraploid species of a plant called salsify (Tragopogon) known as salsify have arisen in western North America. These new species each arose from a diploid species that went through the process of allopolyploidy. This mode of speciation is a type of ________ and it occurs ________.
A. allopatric speciation; very slowly B. sympatric speciation; very slowly C. sympatric speciation; almost instantaneously D. allopatric speciation; almost instantaneously E. adaptive radiation; very slowly
When you first move to a city, you can hardly sleep because of the nighttime traffic noise. Within a week, you don't notice it at all. This is an example of ________
Fill in the blank(s) with correct word
An interesting feeding behavior of the Wilson's storm petrel is
a. plunging to great depths into the ocean in search of food. b. using their feet to paddle just below the water's surface so they appear to be walking on the surface. c. catching a clam and then dropping it over rocks to break it up. d. stealing eggs from nesting birds while the parents are sitting on the eggs. e. skimming over the water surface with its beak partially immersed.