Flashcards
Origins Of Life I
Cards in this deck (21)
- 1What are the 7 characteristics of life?1) Composed of cell(s)
2) Levels of organisation
3) Use energy
4) Respond to stimuli
5) Grow
6) Reproduce
7) Adapt to their enviro + maintain homeostasis - 2What are the 7 chemical characteristics of life?1) Carbon based
2) Use energy
3) Use oxidative gradients
4) Contain proteins/lipids/carbs
5) Use nucleic acids for heredity
6) Use ATP
7) Have same basic met. pathways - 3When did the sun ignite?50 mya solar system creation
- 4When did the LHB occur4.1/3.8 bya
- 5Effects on EarthSterilised earth
Shredded early atmosphere
Water fell to earth
meteorites fell
H became abundant
Magnetic poles established - 6What occurred during the Hadean period?SC life began
The LHB - 7What occurred during the Archaean period?Oxygen production began via photosynthesis
- 8What evolved during the Proterozoic period? (3)Eukaryotes evolved
Chloroplasts evolved
MC organisms evolved - 9What evidence exists for panspermia?Diatoms/nanobacteria identified on meteors from Mars
- 10What did the Miller-Urey experiment hope to achieve?Replicate Early Earth conditions based on the atmosphere of Jupiter
see whether life could form from these constituents - 11What was the Miller-Urey experiment? (4)1) Use water/NH4/CH3/H2
2) Spark with electricity
3) Condense
4) Collect and analyse products - 12What were the products?Simple amino acids formed via formaldehyde
- 13What issues are associated with the primordial soup?Early rock analysis showed atmosphere was scarce of ammonia, methane, and hydrogen
Concentration problem - 14Conditions in Black Smokers (3)Acidic
high pressure
Iron pyrite catalyst - 15Redox reaction on iron pyrite, releasing H2SH2S + O2 -> Energy
- 16What is the main flaw of this theory?Environment was O2 poor and the overall reaction was FLAT.
- 17What improvement was provided as an alternative to this theory?Gunter Wachtershauser proposed
2H2S + Fe -> FeS2 + 4H+
FeS2 then reacts with CO which is found in black smokers. - 18What problem still exists with this theory?Concentration problem
Needs to be confined within a space - 19What is serpentination? (3)Rock mixes with mantle
Gives up sea water
Contaminations in water causes convection to surface - 20Energy production in Alkali ventsEnergy is released as heat as components of seawater are reduced
S -> H2S
N2 -> NH3
CO2 -> CH4 - 21Why are alkali vents considered valid cradles of life? (5)Has appropriate compounds that it can concentrate
Fe-S catalyst
Thermochemical gradient
H2 gas for free energy
Alkali environment on inside
acidic environment of sea provides H+ gradient
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- User has deleted their subject information Flashcards on Origins Of Life I, created by Deleted user on 03/05/2018.
- Created by
- Deleted user · May 2018
- Updated
- May 3, 2018
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- Created by J yadonknow · Mar 27, 2018
- Copied by J yadonknow · May 3, 2018
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