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Lecture 4

BIO 1140 Lecture Notes - Lecture 4: Lipid Bilayer, Murchison Meteorite, Starch


Department
Biology
Course Code
BIO 1140
Professor
Caroline Petit- Turcotte
Lecture
4

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Lec 4 : Macromolecules and Chemistry of the Cell (Jan 22)
Readings : 3.1-3.3
Readings :
3.1
Seven Characteristics of Life :
1. Display order (arranged in a highly ordered manner, cell is fundamental unit)
2.Harness and utilize energy (acquire from enviro, use it to maintain ordered state)
3.Reproduce
4.Respond to stimuli (response to change in external enviro)
5.Exhibit homeostasis (able to regulate internal enviro)
6.Grow and develop (increase size by increasing number of cells)
7.Evolve (change over time to better adapt to their enviro)
emergent properties : emerge from many simpler interactions that in themselves do not have the property
of life
*virus not biotic, because can't synthesize their own proteins
3.2
Chemical origin of life : cells come from pre-existing cells
Earth is 4.6 billion years old
-based on radiometric dating/carbon dating/fossil records
-life : 4.0 bya
Formation
-all components of solar system were made at the same time
-formed by gravitational condensation of matter in interstellar cloud (hydrogen mostly)
-earth cooled down and solidified
Earth
-situated in Habitable Zone (heat from sun allows water to exist in liquid state)
-habitable zones depend on energy output of suns
Formation of Macromolecules
Hypothesis 1 : Reducing Atmosphere (Oparin and Haldane)
-absence of oxygen
-plenty of hydrogen, carbon dioxide, methane, ammonia
-organic molecules formed due to abundance of electrons and hydrogen
-no ozone layer, so uv light gave energy needed to drive the formation of biologic molecules
Miller-Urey Experiment
-stimulates Earth's early atmosphere, added water vapour
-exposed gases to energy source (sparks)
-after one week, organic compounds were formed
Hypothesis 2 : Deep-Sea Vents
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