Which of the following choices best describes the relationship that exists between moisture and air temperature?
A. The moisture-holding capacity of air decreases when it is warm and increases when it is cool.
B. The moisture-holding capacity of air remains the same (warm or cool) and is not related to its temperature.
C. The moisture-holding capacity of air increases when it is warm and decreases when it is cool.
D. The moisture-holding capacity of air decreases as the higher altitude winds of the polar regions descend onto the continents.
C. The moisture-holding capacity of air increases when it is warm and decreases when it is cool.
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If the number of chromosomes in an animal's gametes is 20, then a somatic cell from that animal
would contain ____ chromosomes.
a. 5 b. 10 c. 20 d. 40 e. 80
Speciation caused by a change in the course of a river is an example of ____ speciation
a. divergent b. parapatric c. allopatric d. convergent e. sympatric
Which set of four elements makes up the largest portion of cells by dry weight?
A) carbon, sulfur, potassium, oxygen B) oxygen, nitrogen, phosphorus, hydrogen C) carbon, hydrogen, oxygen, nitrogen D) nitrogen, carbon, sulfur, potassium
Enzymes generally make good drug targets because a specific reaction of interest can be targeted with a high degree of selectivity
Consider the following three drugs and explain why, although reaction-specific, the first two produce side effects, while the third does not. A. Statins inhibit HMG CoA reductase to block intracellular cholesterol synthesis. B. Methotrexate inhibits dihydrofolate reductase, which subsequently leads to blocked DNA replication. C. Gleevec® inhibits BCR, a kinase that is only produced in certain types of leukemia cells.