Chapter 6: A Tour of the Cell AP Biology. Link to Evolution Miller-Urey – cellular components synthesized from early Earth Formation of protocells Fossil.

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Chapter 6: A Tour of the Cell AP Biology

Link to Evolution Miller-Urey – cellular components synthesized from early Earth Formation of protocells Fossil evidence suggests first prokaryotic cells appeared 3.5 BYA First eukaryotes appeared 2.1 BYA Endosymbiosis Multicellular organisms appeared 1.2 BYA

Organelles A specialized structure that performs a certain function within a cell Number and complexity depends on cell type

All Cells Have… Plasma membrane Boundary of cell Controls what enters, leaves Role in communication TEM cross-section of cell membrane

All Cells Have… Cytoplasm/Cytosol Semi-fluid substance Where organelles are found

All Cells Have… Chromosomes Genetic material (DNA)

All Cells Have… Ribosomes Site where protein is made

Prokaryotes vs. Eukaryotes Prokaryotes Small in size (range: 2-20µm) Genome is singular chromosome not organized around proteins Located in nucleoid region (NO nucleus) No membrane-bound organelles Eukaryotes Large size (to 100µm) Genome organized around proteins; multiple chromosomes Located in nucleus Contain membrane-bound organelles