Lecture 16 Flashcards
How is life define ? there are 7
Metabolism, homeostasis , reproduction, growth, adaptation, response to stimuli and cellular organization.
Is evolution a theory about the origins of life
no
Earths timeline ? beginning
4.6 billion years ago
When did earth form ?
4.6 billion years ago
Why was life not possible 4.6 billion years ago ?
It was Hot, water vapor and bombardment
_____ years ago = stable hydrosphere ( cool _____, and _____.)
4.2 billion, cool, ocean forming , no bombardment.
___ -____ years ago = prebiotic chemistry of small ______ compounds from ____ which are packed into PROTOCELLS
4,2- 4.0 , small organic , macromolecules
Abiotic synthesis of organic molecules … organic compounds may have formed under _____ or _____ , , or brought to earth on ______.
Volcanoes, hydrothermal vents, meteors.
1924-29 hypothesis = Early earth’s atmosphere was _____ by electron _____
Reducing, Electron adding
Organic Compounds could have formed from _______
simple molecules
Energy for this synthesis came from ____ or _____
Lightning or U.V rays.
Miller Uray Experiment ( year ____)
1953, the experiment yielded that organic structures can be made from inorganic substances .
Small compounds form ______
Macromelocules
Package molecules into protocells which exhibit _____
Cellular organization , metabolism, reproduction
____ years ago = Pre RNA world
4 billion
What may have preceded RNA as the genetic code ?
Peptide Nucleic acid
What was probably the first genetic material ?`
RNA
___ years ago= RNA world
3.8 Billion
RNA served as the geneti material because ______
It catylized reactions , self replicated , and stored info.
____ years ago = First DNA life
3.7 billion
_____ = composed of layers of Cyanobacteria separated by sediment.
Stromatolite
____ years ago= first DNA life
3.6
Last universal common ancestor was
Hydrothermal vents
The first genes on the Earth were probably
Auto-Catalytic RNA molecules
Which measurements would help determine abosolute dates by radiometric means ?
Acccumulation of daughter isotope, loss of parent isotope, loss of the daughter isotope .
