BIOL 1202 Lecture Notes - Lecture 4: Lightning, Chloroplast, Ammonia

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Chapter 25: the history of life on earth. Describe the conditions and locations where most of these chemical reactions likely occurred on the early earth: describe the evidence that suggests that rna was the first genetic material. Explain the significance of the discovery of ribozymes. Concept 25. 2: the fossil record documents the history of life: explain why the fossil record provides an incomplete chronicle of evolutionary change, explain how radiometric dating can be used to determine the absolute age of rock strata. Co(cid:374)(cid:272)ept (cid:1006)5. (cid:1007): key eve(cid:374)ts i(cid:374) life"s history i(cid:374)(cid:272)lude the origi(cid:374)s of si(cid:374)gle(cid:272)elled a(cid:374)d (cid:373)ulti(cid:272)elled orga(cid:374)is(cid:373)s and the colonization of land: des(cid:272)ri(cid:271)e the (cid:373)ajor eve(cid:374)ts i(cid:374) earth"s history fro(cid:373) its origi(cid:374) u(cid:374)til (cid:1006) (cid:271)illio(cid:374) years ago. 6. 25: the radioactive isotope 40k decays into 40ar and has a half life of 1. 25 billion years. If a newly formed rock contains 100 units of 40k, how many units of 40k would it contain after.

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