Download Bio 8/22/12 -intro: discussing syllabus -87

Bio 8/22/12
-intro: discussing syllabus
-87% guarantees an A
Lecture
-multi level organization
New properties emerge, emerge from the parts
-Reductionism
reduction of complex systems
understanding levels on the basis of parts on lower levels
allows us to explain emergent properties
I. EVOLUTION: living things evolve!!!!
Unifies history of life on earth
-history of the universe (ppt) (read about formation of life in textbook)
6 million years ago divergence between homo sapien and other
HOWEVER 225,000 humans came
-natural selection
natural selection causes ancestral species to result in multiple species
(Galapagos finches)
II. living things obey physics and chemistry (no vitalism)
Louis Pasteur- last person to believe in vitalism
One bastion left in vitalism…nature of mind and consciousness
III. living organisms share certain properties (ppt) (figure in textbook)
IV. all living organisms are composed of cells
Cell is lowest level of organization
All cells are enclosed by a membrane
All cells use DNA as their genetic material
-Eukaryotic cells: membrane enclosed organelles, largest is nucleus
-prokaryotic cells: simplest, smaller and no enclosed organelles
-exponential growth: living things grow exponentially (ppt for formula)
doubling time is a constant
cannot go on forever…becomes unmanageable
-thinking at different levels (ppt)
-how many prokaryotic cells will fit into a single eukaryotic cell?? Assume shaped
like a cube, one micron for prok=25 for euk
-time scale (ppt)
V. Genes specify proteins, which specifies structure and function
-science vs. non science
falsifiability
8/24/12
Chemical Connection to Biology
-organisms governed by physics and chem
-nucleus is a physical size
-CHNOPS- core elements…98% of all life
-Ca, K, Na, Cl are important ions
-all other are trace elements required by organism in minute quantities