EIGHT

Emergent Life I

A Proposed Origin Of Life On Earth:

adapted from Biology, 2015, tenth edition, pp. 439-446

I) chemistry

 

a)inorganic (ionic) minerals,

 

dissolved in

b) water,

 

plus

c)dissolved gases

of the early atmosphere:

 

CO2 (carbon dioxide)

CO(carbon monoxide

HOH (water) vapor

N2 (nitrogen gas)

NH3 (ammonia)

H2S (hydrogen sulfide gas)

CH4 (methane gas)

plus

 

II) energy:

 a)lightning;

 b)cosmic (UV) radiation

plus

 

III) absence of free O2

(oxygen oxidizes - ties up/combines with - essential component ions into "oxides")

plus

 

IV) time (in millions of years)

-sugars

-nucleotide bases of RNA +   DNA

-amino acids

-ATP:adenosine triphosphate

  (also a nucleotide base)

-lipids

yields:

simple organic molecules (organic monomers):

you start with