Core: Cells and Microscopy
- Created by: jross10
- Created on: 30-03-15 12:17
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- Cells and Microscopy
- Plant and Animal cells - similarities and differences.
- 4 things they have in common: nucleus; cell membrane; cytoplasm; mitochondria (where most reactions for respiration take place)
- 3 extra things Plant cells have: rigid cell walls; large vacuole; chloroplasts
- Bacterial cells have no nucleus
- Bacterial cells are a lot smaller than plant or animal cell
- chromosomal DNA (long circular chromosome):controls the cells activities and replication; it floats in the cytoplasm
- cell is supported by a cell wall
- plasmids (small loops of extra DNA that aren't part of the chromosome):contain genes for things like drug resistance and can be passed between bacteria
- flagellum (plural flagella): is a long, hair like structure rotates to make bacterium move
- Cells are studied using microscopes
- microscopes let u see things we cant see with he naked eye
- light microscopes invented in 1590's: let us see things like nuclei; chloroplasts; mitochondria
- electron microscopes invented in 1930's: let us see much small things in more detail like internal structures
- magnification = length of image/length of specimen
- Plant and Animal cells - similarities and differences.
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