Bio 112 EXAM 1 REVIEW

Bio 112 EXAM 1 REVIEW - Bio 112 EXAM 1 REVIEW Chapter 26-...

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Bio 112 EXAM 1 REVIEW Chapter 26- Origin of Life The Earth is 4.6 billion years old The four major stages that lead to the origin of life are- o Abiotic synthesis of organic molecules o Joining of these small molecules into polymers (i.e. proteins) o Packaging of these molecules into “Protobionts” o Origin of self-replicating molecules (made inheritance possible) Early Earth’s condition o Bombarded with chunks of rocks and ice for the 1 st few hundred million years o Atmosphere Contained water vapor and many chemicals released by volcanic eruptions As Earth cooled, water vapor condensed into oceans Geologic Time Scale See Print out or pg 519 Timeline for major events in the formation of life o Prokaryotes were Earth’s sole inhabitants from 3.5-2 billion years ago Chapter 27- The Prokaryotes General Characteristics o Spherical (cocci) o Rod-Shaped (bacilli) o Spiral Overall components o The cell wall is one of the most important features of nearly all
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This note was uploaded on 03/26/2008 for the course BIOL 112 taught by Professor Vaughn during the Spring '08 term at Texas A&M.

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Bio 112 EXAM 1 REVIEW - Bio 112 EXAM 1 REVIEW Chapter 26-...

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