Water balance is maintained by the structures labeled
a. 1 and 3.
b. 5 and 9.
c. 7 and 8.
d. 6 and 9.
e. 1 and 6.
D
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A chromosome's gene sequence that was
ABCDEFG before damage and ABFEDCG after is an example of a. inversion. b. deletion. c. duplication. d. translocation. e. aneuploidy.
In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best and most pure breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ? silver ? all silver offspring; (2) silver ? platinum ? equal numbers of silver and platinum; (3) platinum ? platinum ? 2 platinum for each silver offspring. Explain. What will be an ideal response?
Why is combination drug therapy less likely to lead to resistance than single drug therapy?
A) In the presence of multiple drugs, the mutation rate of HIV decreases. B) The drugs improve the immune system so that it's better able to find and remove virus particles. C) The likelihood of one virus spontaneously mutating to be resistant to three different drugs is extremely small. D) There are fewer side effects associated with combination drug therapy, and the appearance of resistance is directly proportional to the severity of side effects.
A biogeochemical cycle involves the cycling of a chemical element between the biomass, exchange pool, and ________
Fill in the blank(s) with correct word