Origin of life on earth
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3 origin of life theories?
- special creation
- spontaneous generation
- extraterrestrial contamination
special creation states that life on earth is the direct result of?
not a scientific theory that can be tested, but rather a test of faith, it is not a science but a religion
life can arise from nonliving materials in the greatest possible form
who discovered spontaneous generation?
what did Pasteur use to find out about spontaneous generation?
swan necked flask experiment
what did pasteurs swan necked flask experiment conclude?
where no life previously exists, none will appear magically
disproves spontaneous generation?
pasteurs swan necked flask experiment
what did Pasteur conclude about Spontaneuous generation?
it does not happen under current conditions
how was Pasteur wrong about his conclusion?
life did arise from non living matter, but under very different conditions that exist today
evolutionary process went through three distinct phases?
how many years ago did the earth condense from rocks, dust and gas
4.5 billion years
lighter elements begin to form a?
- and other gases
what is not included in the proatmosphere?
in chemical evolution, energy sources of drive chemical reactions
- electrical discharge
what occurs during chemical evolution?
prebiotic synthesis of organic carbon based compounds occurs
did urey miller experiment create life?
what did urey miller experiment prove?
that it is possible to create a chemical environment could serve as the basis for the evolution of life
urey miller experiment stated that it is possible to _____ create a primordial soup
what is considered alive? must have:
- metabolic system
- genetic system
under controlled conditions, large macromolecules, proteins, lipids, will spontaneously form?
coacervative droplets could serve as?
the basis for a membrane
who talked about membrane formation?
initially in the evolution of metabolic pathways, everything was provided by?
current genetic system?
DNA--- RNA--- protein
tom cech discovered that some RNA's can act as ?
_____ could carry genetic information and express it
primordial world was probably an ?
life on earth is the result of ?
contamination by some extraterrestrial organism
extraterrestrial contamination is?
- possible but impossible to test
- puts the origin of life off the planet
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