Which of the following best explains the differences between the HIV within-host and population phylogenies shown below?
a. The within-host environment results in higher HIV mutation rates.
b. There is very little cross-resistance for HIV strains from different host individuals.
c. Infections of new hosts are rare in sexually transmitted diseases like HIV.
d. The population size of hosts is much smaller than the number of viruses in a single patient.
B
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When compared to the Bacteria and the Eukarya, structurally, the Archaea more closely resemble the ____ ; genetically and biochemically, the Archaea more closely resemble the ____
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Which of the following types of cellular activities can be a response to cell signaling?
A. Cell division is triggered. B. Gene expression patterns are changed. C. Enzyme activity patterns are changed. D. Cell signals are released to communicate with other cells. E. All of these choices are correct.
What is the role of ATP synthase?
A. It uses ATP to make glucose. B. It uses a proton gradient to make ATP. C. It uses ATP to make a proton gradient. D. It synthesizes ATP directly from glucose.
After generating a hypothesis, a scientist next:
a. makes a prediction. b. writes a grant proposal. c. does an experiment. d. formulates a theory. e. designs a series of tests.