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

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Published on 29 Sep 2012
School
Western University
Department
Biology
Course
Biology 1001A
Professor
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
bacteria)
- 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
Types
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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Document Summary

Transmission electron micrograph used to take image of cell. 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. 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. 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 bacteria) 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. Very important in moving chromosomes around during cell division.

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