Chem147MT2

Chem147MT2 - Chem 147 Second Midterm Examination 9...

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Chem 147 Second Midterm Examination 9 November, 2001 1. Describe the evidence in favor of the RNA-world hypothesis (15pts). 2.We have discussed the possibility that the first living thing was a ribozyme that was an RNA- dependent RNA polymerase. If it was the first living thing, it must have been synthesized abiotically from simpler materials that could be synthesized in Miller-Urey chemistry and plausible, solution (ocean)-phase chemistry. Argue the case that the preboitic synthesis of a sufficiently complex RNA is highly im probable (15pts). 3. If the RNA-world was so great, why were proteins invented? (10 pts) If the RNA-world was so great, why was DNA invented? (10 pts) It is thought that some ribozymes can autocatalytically link themselves to an amino acid. What selective advantages might this provide for the earliest, simplest organisms? (10 pts) 1. It appears that atmospheres of rocky (terrestrial-type) planets become more oxidized over geological timeframes. What is the reason for this? Please cite evidence in favor of your theory. (15 pts)
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This note was uploaded on 07/13/2009 for the course CHEM 147 taught by Professor Plaxco,k during the Summer '08 term at UCSB.

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Chem147MT2 - Chem 147 Second Midterm Examination 9...

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