Chapter 25 Slides Sections 1-3
Chapter 25 Slides Sections 1-3 Chapter 25 Slides Sections 1-3
The First Eukaryotes • The oldest fossils of eukaryotic cells date back 2.1 billion years • Eukaryotic cells have a nuclear envelope, mitochondria, endoplasmic reticulum, and a cytoskeleton • The endosymbiont theory proposes that mitochondria and plastids (chloroplasts and related organelles) were formerly small prokaryotes living within larger host cells • An endosymbiont is a cell that lives within a host cell AP Biology © 2011 Pearson Education, Inc.
First Eukaryotes • Development of internal membranes create internal micro-environments advantage: specialization = increase efficiency infolding of the plasma membrane • natural selection! plasma membrane endoplasmic reticulum (ER) ~2 bya nuclear envelope nucleus DNA AP Biology Prokaryotic cell cell wall Prokaryotic ancestor of eukaryotic cells plasma membrane Eukaryotic cell
- Page 1 and 2: “…sparked by just the right com
- Page 3 and 4: Concept 25.1: Conditions on early E
- Page 5 and 6: • In the 1920s, A. I. Oparin and
- Page 7 and 8: Conditions on early Earth AP Biolog
- Page 9 and 10: Stanley Miller University of Chicag
- Page 11 and 12: Abiotic Synthesis of Macromolecules
- Page 13 and 14: • Adding clay can increase the ra
- Page 15 and 16: Self-Replicating RNA and the Dawn o
- Page 17 and 18: The Fossil Record • Sedimentary r
- Page 19 and 20: • Few individuals have fossilized
- Page 21 and 22: Fraction of parent isotope remainin
- Page 23 and 24: Concept 25.3: Key events in life’
- Page 25 and 26: Table 25.1 AP Biology
- Page 27 and 28: Table 25.1b AP Biology
- Page 29 and 30: Figure 25.7-3 Cenozoic Humans Colon
- Page 31 and 32: Figure 25.UN03 1 4 2 3 AP Biology A
- Page 33 and 34: • By about 2.7 billion years ago,
- Page 35: Figure 25.UN04 1 4 AP Biology Singl
- Page 39 and 40: 2 nd Endosymbiosis • Evolution of
- Page 41 and 42: Figure 25.UN05 1 4 2 3 AP Biology M
- Page 43 and 44: Figure 25.UN06 Animals 1 4 2 3 AP B
- Page 45 and 46: AP Biology
- Page 47 and 48: Figure 25.10 Sponges Cnidarians Ech
- Page 49 and 50: The Colonization of Land • Fungi,
- Page 51: Is there life elsewhere? Does it lo
First Eukaryotes<br />
• Development of internal membranes<br />
create internal micro-environments<br />
advantage: specialization = increase efficiency<br />
infolding of the<br />
plasma membrane<br />
• natural selection!<br />
plasma<br />
membrane<br />
endoplasmic<br />
reticulum (ER)<br />
~2 bya<br />
nuclear envelope<br />
nucleus<br />
DNA<br />
AP Biology<br />
Prokaryotic<br />
cell<br />
cell wall<br />
Prokaryotic<br />
ancestor of<br />
eukaryotic<br />
cells<br />
plasma<br />
membrane<br />
Eukaryotic<br />
cell
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