September 14, 2011 Biology 311C Lecture 9 • Use online modules to study for exam. Take notes from book. **Try to do goals from learning outcome guideline. Do the tests at the end of each section and chapter in book. Do Mastering Biology activities and tests. • Nucleotides get added at the 3’ end of the DNA strand. When there is a hydroxyl group, a dehydration reaction may occur. • In RNA, the A complimentary acid is A, not T. • **Make a chart that compares the structure and function of DNA and RNA. • By 4.5 billion years ago, the Earth and the other plants in the Solar system had formed. • Outgassing and volcanic activity produced the primordial atmosphere of the Earth. • Chemical evolution: simple organic molecules from inorganic precursors. Certain chemical are successful and more like to stick around and evolve later. • Perhaps an extraterrestrial origin of organic molecules? On September 28 th , 1969, near the town of Murchison, Australia, a bright fireball was observed.
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