Class Notes (834,756)
Canada (508,705)
Biology (Sci) (2,472)
BIOL 101 (39)

Lecture 1 Notes.docx

2 Pages
Unlock Document

Biology (Sci)
BIOL 101
Rudiger Krahe

Lecture 1 Notes Earth 4.5 bilion, life 3.8 Metabolism – all the chemical reactions that go on inside a cell Cyanobacteria – Photosynthetic prokaryotes that introduced oxygen to the earth’s atmosphere Ozone layer formed 800 million years ago from accumulation of O2, gave UV protection Chemical evolution… Miller-Urey Experiment: H, NH3, CH4, H2O in atmosphere and zapped with lightning Ribozymes – Catalytic RNA Condensation Reaction – Putting monomers into polymers 1. Solid mineral surfaces, silicates are catalytic 2. Hydrothermal vents, contain metals, the metals are shown to catalyze polymerization of amino acids 3. Hot pools at edge of ocean, through evaporation, have many concentrated monomers, so polymerization was favoured Spontaneous Generation – the idea that life arose from inanimate or decaying matter Stromatolites – Rocklike structures formed by cyanobacteria, preserved in fossils PRECAMBIAN 4.5BYA – 600MYA  3.8 BYA O2 first appears in atmosphere. ORIGIN OF LIFE. PROKARYOTES FLOURISH  1.5 BYA O2 level at >1% of current. EUKARYOTES EVOLVE.  600 MYA O2 level at >5% of current level PALEOZOIC 542 MYA – 297MYA  CAMBRIAN – 542 MYA O2 approach current levels. Most animal phyla present; divers
More Less

Related notes for BIOL 101

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.