Lecture 16 - Origins of Life Flashcards
1
Q
What are the 7 ways that life is defined?
A
- metabolism
- reproduction
- cellular organization
- homeostasis
- growth
- adaption
- response to stimuli
2
Q
Evolution is a theory about the origin of life (T/F)
A
False
3
Q
What did Darwin believe about all organisms?
A
They trace back to a single ancestor
4
Q
Was life on earth possible at the beginning?
A
no
5
Q
What happened 4.6 billion years ago?
A
formation of earth
6
Q
What happened 4.2 BYA? What did that encompass?
A
- stable hydrosphere
1. bombardment ends
2. earth cools
3. oceans form
7
Q
What is prebiotic chemistry? What years?
A
- 4.2-4.0 BYA
1. abiotic synthesis of small organic compounds
2. joining of small molecules into macromolecules
3. packaging of molecules into protocells
8
Q
What are some examples of small organic compounds?
A
CH4
9
Q
What is an organic compound?
A
C with H bonds
10
Q
What is the Oparin-Haldane hypothesis?
A
- atmosphere was reducing (electron adding)
- catalyze reactions to form more complicated organic molecules from simpler molecules.
- energy for synthesis may have come from lightning + UV radiation
11
Q
Who was Stanley Miller?
A
- Chicago student
- made contraption (added lightning to simple compounds)
- tested Oparin-Haldane hypothesis
- found amino acids after 7 days
12
Q
What are 3 ways that organic compounds could have been formed?
A
- under volcanic or hydrothermal conditions
- hydrothermal conditions
- brought to Earth on meteorites
13
Q
What year was the Miller Urey experiment?
A
1953
14
Q
What are macromelcules
A
EX: amino acids into proteins
15
Q
What serves as catalysis for macromolecule formation?
A
clay surfaces
