The fastest lions are able to catch prey, such as zebras; similarly, the fastest zebras are able to escape predatory lions
Over time, the lion and zebra populations become composed of faster and faster individuals. This is an example of ____.
a. mutualism
b. competition
c. coevolution
d. disruptive selection
e. sexual selection
ANSWER: c
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According to the cohesion-tension mechanism of water transport, cohesion occurs because
a. waxy coatings on insides of xylem keep water molecules together in the xylem. b. evaporation removes water from the leaves. c. water molecules tend to form hydrogen bonds with each other. d. water is pushed into the xylem by bulk flow. e. water is pushed into the xylem by phloem pressure.
Sulfur dioxide is a natural product of volcanoes and hot springs, and by itself, it is not acidic. How, then, is excess sulfur dioxide linked to acid rain or acid deposition?
What will be an ideal response?
Describe stratification of environmental factors in lakes, and how this changes with eutrophication. Mention how eutrophication changes the location and abundance of different types of microorganisms living in lake systems.
What will be an ideal response?
Which of the following is NOT true of the plasma membrane?
A. It is composed of an extracellular and intracellular layer of phospholipids. B. The extracellular and intracellular layers or leaflets are highly symmetrical. C. The membrane contains peripheral proteins. D. Integral proteins span through the membrane. E. The membrane contains glycolipids and glycoproteins.