earth’s atmosphere & the origin of life. stages of earth’s atmosphere reducing atmosphere...
TRANSCRIPT
Reducing Atmosphere
• Major GasesHydrogen (very reactive) and
subsequently Methane, Ammonia, Hydrogen Sulfide, and Water Vapor
Important Reactions
• H2 + Oxygen Comp. Water
• H2 + Nitrogen Comp. Ammonia (NH3)
• H2 + Carbon Comp. Methane (CH4)
• H2 + Sulfur Comp. Hydrogen Sulfide (H2S)
Origin of Organic Molecules
• Stanley Miller demonstrated that Earth’s earliest atmosphere could produce some organic molecules arise from inorganic substances
• Organic Molecules are complex compounds that contain Carbon and Hydrogen atoms
Important Reactions
• PhotodissociationH2O with UV radiation H2 + O2
Oxygen Gas Ozone (O3)
• Reactions involving OxygenO2 + NH3 Nitrogen Gas (N2) + H20
O2 + CH4 Carbon Dioxide (CO2) + H20
(Greenhouse Effect)
The Cell
• The cell is a place where chemical reactions occur.
• The container is composed of phospholipids having hydrophilic heads and hydrophobic tails.
Oxidizing Atmosphere
• Major GasesNitrogen, Carbon Dioxide, Oxygen,
Ozone
• Evolution of Eukaryotic Cells
Endosymbiont Hypothesis
Eukaryotic cells containing
a nucleus and membranebound organelles
(Chloroplasts and
Mitochondria) are believed
to have arisen from
Prokaryotes thatincorporated other
Prokaryotes.