cell evolution outline - Cell Evolution pages 507 to 517 To...

Cell Evolution pages 507 to 517. To 25.3
1. As far as we can tell, conditions within a young earth made life possible then (not
now)
a. The earth is though to be 4.6 billion year old.
b. Early earth atmosphere was probably a reducing atmosphere. (If not then
small areas existed like near thermal vents in the deep ocean that were)
i. Under these conditions organic molecules can be made in an
abiotic way.
ii. Under these conditions organic molecules have a very long life
span.
c. Organic molecules including AA have been found in meteorites.
d. The creation of Macromolecules is relatively easy to recreate using
various energy sources (heat, electricity) and inert surfaces including sand,
clay and rock.
e. Precursors to cells called Protobionts can be made in the laboratory using
the self assembling properties of lipids and hydrophilic proteins in
aqueous solutions.
i. Given the stability of organic molecules in this environment,
random associations would last a long time.