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Abiogenesis - Bozemanbiology - Uriel M
terms and key concepts/questions from Biology concepts and connections sixth edition
20
Biology
10th Grade
04/29/2012

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Term
conditions on early Earth 
Definition
immense heat, atmospher thick with water vapor, intense lighting, and volcanic activity, and much more UV radiation.
Term
Stromatolites 
Definition

layered rock that is created when photosynthetic prokaryotes bind thin layers of sediment together then migrate to the top of the layer and start a new one, stromatolites are te earliest evedence of life on earth.

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Term
what are the four steps in the hypothisis that explanes how simple cells were created
Definition

1. The nonliveing synthisis of small organic molicules such as amino acids

 

2.      The joining of these molecules into macromolecules, like proteins

 

3.        The packiging of these molecules into "protobionts"

 

4.                          The origin of self-replicating molecules   

 

Term

why was the fact that O2 was not present in the atmospher important in the abiotic synthesis of organic molecules  

Definition
O2 is a strong oxidizing agent, with it present it would of disrupted the chemical bonds that occured spontaniously that created molecules abioticily.
Term
Abiotic 
Definition
nonliving 
Term
Protobiont 
Definition
Molecules within a membrane 
Term
how were Protobiont's formed spontaneously 
Definition
Abiotic moleclues that were hydrophobic organized themselfs into a layer, much like the lipid bilayer. 
Term
RNA world 
Definition
the hypothetic period in the evolution of life when RNA served as both rudimentary genes and cataytic molecules.
Term
Ribozymes
Definition
RNA that can carry out a number of enzyme like functions
Term
Why is it beleved that RNA were the first genes present 
Definition
Because short RNA strands can replicate themselfs spontaneously 
Term
How were polymers formed without dehydration reactions 
Definition
They may have come in contact with hot sand, clay, or rocks.  
Term
What are the importance of Miller-Urey type experiments 
Definition
They demonstrate that the abioltic synthesis of organic molecules is possible 
Term
What were the principal Compounds present in early Earth's atmosphere
Definition
Nitrogen, CO2, Methane, Ammonia, Hydrogen, and Hydrogen sulfide
Term
Were did the energy for the Abiotic synthesis come from
Definition
lighting, and intence UV radiation
Term
"primitive soup"
Definition
The Earth's early oceans that were a soultion of organic molecules. 
Term
When did natural selection first occur 
Definition
when Self replicating RNA strands were present, those that grew and replicated more effecently had a higher fitness.
Term
Were could you find the type of enviroment studied in the Miller-Urey experiments on early Earth
Definition
It is hypothesized that near volcanic openings.
Term

A.I Oparin and J.B.S Haldane

Definition
Scientists from the 1920's that proposed the experiment that Stanley Miller conducted.
Term
Prebiotic 
Definition
before life 
Term
Why is it belived that the first form of life did not do photosyntesis? 
Definition
Because photosynthese is a complex process, so significant time must have elaped before life could have become complex enough for photosyntesis. 
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