How long ago did the sun and planets form?
4 steps to get to evolution of basic cells:
A. abiotic synthesis of small organic molecules-
Three ideas on how this could have happened include: extraterrestrial origins, deep sea vents, reducing atmosphere
B. single molecules (monomers) join with other molecules to produce polymers- clay lattice
C. self replication- RNA evolved before DNA- DNA was selected due to its stability
D. polymers and monomers packed into protobionts
What is the evidence supporting each hypothesis of the abiotic synthesis of organic molecules?
a. Miller/ Urey experiments-recreated reducing atmosphere- synthesized amino
b. Hydrothermal vents-reducing atmospheres exist
life around vents relies on sulfur for energy instead of the sun.
c. Extraterrestrial origins- large proportion of dust in universe has amino acids
which are raining down on us on a regular basis
What is the evidence that supports RNA being the original unit of heredity?
When did the first cells appear?
First cells appear ~3.5BYA
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