Lecture 2 Flashcards
1
Q
what is a molecule?
A
- chemical structure consisting of two of more atoms
2
Q
what is a theory and hypothesis?
A
- an idea intended to explain something
- proposed explanation made of the basis of limited evidence as a starting point for further investigationg
3
Q
postulated meaning?
A
- suggest/assume existence/fact/truth of something as a basis for reasoning/discussion/belief
4
Q
life changed over time?
A
- originally anaerobic organisms
- aerobic Cyanobacteria
- increased oxygen content of oceans
5
Q
three types of theories to life?
A
- primordial soup hypothesis
- meteorite theory
- hydrothermal vent theory
6
Q
primordial soup hypothesis
A
- oparin-haldane hypothesis
- life began with formations of simple molecules
- reducing atmosphere of early earth produced organic molecules from simple molecules
7
Q
miller experiment?
A
- stanley miller, tese soup hypothesis
- mimic early earth conditions
- waster (flask heated, as early sea)
- higher flask of gases for atmoshpere
- sparks discharged for lightning
- variety of organic molecules identified (common organisms)
- organic molecules must have been requirement in origin of early life
8
Q
meterorite theory?
A
- landed in australia
- source of organic material
9
Q
hydrothermal vent theory?
A
- vents found km under sea
- chemicals and energy fueled necessary reactions
- black smoker vents (unstable, high temp.)
- alkaline vents (white smoker; stable low temp.) [more suitable for origin of life]
10
Q
protobionts?
A
- first cell
- microshperes of inorganic+organic molecules in lipid bilayer
- not alive but some traits of life
- needed building blocks (RNA/DNA)
- needed replication of genetic material
