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EvoPset1Questions2013

How is it possible for us to estimate the time at

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Question 21 of 22 4.0 Points How is it possible for us to estimate the time at which HIV made the jump from chimps to humans? Pick the ONE BEST CHOICE:
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4/5/13 8:17 PM 2013 Problem Set 1 on Evolution Lectures 1-3 Page 8 of 8 https://coursework.stanford.edu/portal/tool/1c2f43e9-1653-4e97-98f7-93a4fbb2cb09/jsf/delivery/beginTakingAssessment A. We have written documentation of the exact incidence of HIV being transferred to a human. B. By plotting the genetic divergence of HIV through time we can extrapolate back in time to estimate when it originated. C. We can tell by the number of people that have HIV now and by the rate of its spread, when it must have originated in the human population. D. By seeing how structurally different human HIV is from Chimp SIV we can infer when they must have split. Reset Selection Mark for Review What's This? Question 22 of 22 4.0 Points Which of the following hypotheses about the early history of life do most scientists agree with? Pick ALL that apply: A. The first molecule of life was most likely amino acids, which experimental data suggests formed spontaneously in earth's early atmosphere and had the capability of replicating itself. B. The first molecule of life was most likely RNA molecules which were capable of self-replication, since experimental data show RNA can catalyze chemical reactions such as splicing. C. Most likely, it is only after DNA and proteins evolved that natural selection started to be an important force. D. The evolution of eukaryotes had little to do with the existence of prokaryotes and most likely was a consequence of the increase in amount of water available. E. The earliest evidence of the existence of life is a bacterial fossil that dates back to ~3.5 billion years ago. F. The earliest evidence of the existence of life is based on altered ratios of carbon 12 to carbon 13, which is an indirect sign of biological activity, in rocks dating back to ~3.8 billion years ago Mark for Review What's This? Save Exit Assignment Preview - This is an example student view of this assignment done
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