origin of life Flashcards
what is needed for life
water
atmosphere
carbon
how did life on earth probably form
earth’s stmosphere had: hyfrogen cyanide,
carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water and
UV radiation amd lightening bombarded the atmospher, creating organic compounds
what is primordial ooze?
*The original conditions for life on earth
term introduced by the Soviet biologist Alexander Oparin. In 1924, he proposed the theory of the origin of life on Earth through the transformation, during the gradual chemical evolution of molecules that contain carbon in the primordial soup.
what was the Miller Urey experiment
experiment showing orgainc molecules can be made from inorganic by representing the conditions of early earth life
whats the meteorite hypothesis
think that a meteoite fell to earht near australia, containing 90+ amino acids (19 of which are found on earht)
what is the iron sulfide bubbles hypothesis
hydrothermal vents produced sulfur that mixed wiht ocean WATER TO make compartments of rock that may have had the conditions necessary for early life forms
what is the lipid membrane hypothesis
lipid membranes spontaneosly form membran enclosed spheres (liposomes) that could have lead to early cells
time periods
1-precambrian
2-paleozoic
3-mesozoic
4-cenozoic
what orgainsms in precambrian?
unicellular and early invertebrates
how old is earth
4.6 byold
what organisms in paleozoic
invertebrates (aquatic life)
fish, amphibians, reptiles
first plants
what happened between precambrian and paleozoic
cambrian explosion
what happens between paleozoic and mesozoic time periods
purmian extinction
mesozoic organisms
dinosaurs
birds
cenozoic organisms
mammals and humans
