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Biology 1001A Lecture Notes - Transmission Electron Microscopy, Nuclear Membrane, Nucleoid

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BIOL 1001A
Tom Haffie

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Lecture 3 Cell Division
- Transmission electron micrograph used to take image of cell
Prokaryotic Cells
- May have one or two membranes around the outside depending on which
prokaryotic cell it is
- Not much going on in the inside, mainly a central nucleoid region
- And then some cytoplasm around the outside of the nucleoid region
Eukaryotic Cells
- Very complex in terms of membranes
- Have internalized their membranes to create some of the now familiar
internal membranes, the nuclear envelope and the ER
- Eukaryotes have internal membranes (e.g. around nucleus. ER, cytoplasm)
- Some internal membranous organelles were the result of endosymbiosis
where early cells entered into very intimate relationships between aerobic
bacterium that have now become mitochondria (used to be free living
- Other photosynthetic bacteria became chloroplasts
Cytoskeleton Review
- A series of woven proteins that help maintain the shape of cell (cables,
pullies and ropes)
- Communicates from the cell membrane/surface all the way to the nucleus
- Aid in cell division
- Very important in moving chromosomes around during cell division
1. Tubulin is a protein that polymerizes to create Tubulin
2. Keratin is also a protein that is part of the Intermediate Filament
3. Actin is a protein, they polymerize to form Microfilament
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