The maximum number of individuals of a
species that a given environment can sustain
indefinitely defines
a. the carrying capacity of the environment.
b. exponential growth.
c. the doubling time of a population.
d. the density-independent factors.
e. all of these
A
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In experiments to show that DNA is the genetic material, Hershey and Chase labeled DNA with radioactive
A) amino acids. B) sulfur. C) phosphorus. D) carbon.
The requirement of cold weather before a
particular plant process occurs (e.g., flowering) is known as
a. the biological clock. b. vernalization. c. photoperiodism. d. biennial life cycle. e. biorhythm.
Suppose two genes a and b are 7.4 map units from each other, and that genes b and c are 5.7 map units from each other. You do a cross to determine the map distance between a and c. Which result would indicate that c lies between a and b?
a. 2.0 map units b. 11.1 map units c. 14.8 map units d. 15.0 map units
Considering that leaf stoma have the conflicting functions of allowing gaseous carbon dioxide into the leaf, yet preserving the plant's supply of water, which of the following is (are) reasonable?
A. Corn, oats, rice, and wheat-all monocots-have relative upright blades with sunlight hitting both sides and would have stoma distributed evenly on both sides. B. Tree leaves that orient flat and present the top side to the sun would have most of their stoma on the bottom of the leaf. C. A submerged-water plant would have no stoma. D. All of the choices are reasonable. E. None of the choices are reasonable, since stoma are found uniformly on all type of leaves.