Enduring understanding 1.D: Theorigin of living systems is explained

by natural processes.

Essential knowledge 1.D.1

There are several hypothesesabout the natural origin of life on Earth, each withsupporting scientific evidence

http://www.youtube.com/watch?v=pMoA65Dj-zk&feature=fvwrel

http://www.youtube.com/watch?v=pMoA65Dj-zk&feature=fvwrel

4.1 Organic Chemistry in the study of carbon compounds

Organic compounds on early Earth Extraterrestrial sources Abiotic synthesis of polymers Protobionts http://

www.youtube.com/watch?v=jTCoKlB0s4Y http://

www.youtube.com/watch?v=cosMs5EtktY http://

www.youtube.com/watch?v=CXhdu6HJpDg

26.1 Conditions on early Earth made the origin of life possible

Biotic Abiotic Polymers Monomers Protobionts

26.1 vocabulary

◦Stromatolites

Endosymbiosis - next three slides

Genetic chimera

26.3 As prokaryotes evolved, they exploited and changed young Earth

Fig. 29.2

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Plasma membrane

Infolding of theplasma membrane

Nucleus

Plasma membrane

Endoplasmic reticulum (ER)Nuclearenvelope

Eukaryotic cell

Prokaryotic ancestorof eukaryotic cells

Prokaryotic cell

DNA

Fig. 29.3

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Eukaryotic cell with mitochondrion

Chloroplast

Endosymbiosis

Endosymbiosis

Photosynthetic bacterium

Mitochondrion

Internal membrane system

Eukaryotic cell with chloroplastand mitochondrion

Aerobicbacterium

Ancestraleukaryotic cell

Fig. 29.4

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Eukaryotic cell

Nucleus

Red algal nucleus lost

Cyanobacteria Red alga

Eukaryotic cell

Brown alga

Nucleus

Nucleus

SecondaryEndosymbiosis

PrimaryEndosymbiosis

Chloroplastwith twomembranes

Organelle withfour membranes

CONJUGATION

26.4 Eukaryotic cells arose from symbioses and genetic exchanges between prokaryotes

Oldest fossils of multicellular eukaryotes 1.2 – 1.5 billion years

1st eukaryotes were colonized special cells

Cambrian Explosion Colonization of land

by fungi, plants, & animals

Drifting continents separated organisms, furthered evolution

26.5 Multicellularity evolved several times in eukaryotes

To know:Benchmark a, 5 parts

See Unit Organization Handout

Essential knowledge 1.D.1