How did chemisty and oceans produce this?

Remember the two keys to evolution of planetary atmospheres:

• Fate of the water vapor (gaseous, liquid, solid)
• Fate of the Carbon Dioxide (stays in atmosphere vs. dissolves in liquid water)

After condensation of water vapor produced the earth's oceans, thus sweeping out the carbon dioxide and locking it up into rocks, our atmosphere was mostly nitrogen.

So now let's make some life over the next billion years or so:

Amino Acids now loosely mixed in the oceans

• 2D view of glycine
• 3D view of glycine

• Most amino acids have a mirror image (L and D)
  • L and D both found in meteorites
  • L only in organisms on the earth
  • why is D selected against?

So now we have some amino acids (monomers) loosely mixed in the oceans. Liquid medium is important:

• Protects molecules from UV photon disruption
• Ease of transport and Interaction

Next goal is to combine monomers into Polymers (peptide chains)

Example formation of a peptide chain

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