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FIU - BSC 2011 - Class Notes - Week 1

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FIU - BSC 2011 - Class Notes - Week 1

School: Florida International University
Department: Biology
Course: general biology II
Professor: Dr. Ligia-Collado-Vides
Term: Spring 2018
Tags: Biology
Name: BSC2011 lecture notes week 1
Description: Notes on the origin of life
Uploaded: 01/12/2018
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background image General Bio II – BSC 2011 Lecture Notes Origin of Life  Earth formation as a hot mass of molten rock about 4.5 billion years ago Cooling of planet, formation of chemically rich oceans formed from water 
condensation
Chemically rich waters became rich enough to allow life 
to grow
Origin of life is the result of chemical processes 
happening in the right conditions 
Photosynthesis helped create oxygen  Archaea were the first life forms  Photosynthetic organisms had a large impact on the planet  Increased diversity and complexity  Radiometric dating             How do we know how old things are on earth? Elements have radiometric isotopes that can be used to test how much 
radiation there is. 
Isotopes are different forms of the same elements Elements are converted from one form to another through radioactive decay  Radioactive decay occurs at a constant rate The half life of an element is the amount of time it takes
for one half of a sample to decay.
Questions  Describe original conditions of the planet and how it eventually got to the 
point that life would arise?
What were the first chemical processes and compounds that gave rise to life? How do you estimate how old rocks or fossils are what kind of samples do you
use?
Other beliefs  Panspermia  The hypothesis that life exists throughout the universe. Life may 
have infected earth from some other planet, distributed by space 
dust, meteoroids, asteroids, comets, etc.
Few geochemists agree on exact compositions of early atmosphere Experiments  Miller & Urey experiment < read up on it Found within a week that methane gas converted into other gas

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School: Florida International University
Department: Biology
Course: general biology II
Professor: Dr. Ligia-Collado-Vides
Term: Spring 2018
Tags: Biology
Name: BSC2011 lecture notes week 1
Description: Notes on the origin of life
Uploaded: 01/12/2018
2 Pages 24 Views 19 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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