'Origin Of Life' Ap Biology Worksheet
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4AP BIOLOGY
NAME_____________________
EVOLUTION/HEREDITY UNIT
Unit 1 Part 11 Chapter 25
DATE____________PERIOD____
Activity #15
ORIGIN OF LIFE
HISTORY OF LIFE
•
Earth is 4.5 billion years old
•
Oldest rock o 3.8 billion years old o
Contains isotopes of carbon o Indicates
metabolic activity
•
Oldest fossils
3.5 billion years old
Stromatolites
Banded domes of sedimentary rock
Resemble layered mats of cyanobacteria today
•
Probably photosynthetic o Probably not first life forms
•
First life forms were NOT photosynthetic
O
H
NE
YPOTHESIS
C
E
S
ONDITIONS ON
ARTH
CENARIO
1.
•
Atmosphere had little O
Abiotic synthesis of organic
2
•
Intense o Lightning
monomers
•
2.
Volcanic activity
Abiotic synthesis of polymers
•
Meteorite bombardment
3.
Formation of protobionts
•
UV radiation
4.
Origin of hereditary material
ABIOTIC SYNTHESIS OF ORGANIC MONOMERS
1920S
1953
OPARIN & HALDANE
MILLER & UREY
•
•
Worked independently
Tested Oparin & Haldane hypothesis
•
•
Postulated
Created conditions on early Earth in lab
•
Conditions on primitive Earth
•
Atmosphere – H
O, H
, CH
, NH
2
2
4
3
favored abiotic synthesis of organic
•
Added spark
material
•
Created organic material
o Atmosphere
•
Other labs have created
Contained less O
2
o
All 20 AA
Less oxidizing than today’s
o
Some sugars & lipids
More reducing than today’s
o
Purine & pyrimidine bases
o
ATP
EVOLUTION #15
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