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2169959
Edexcel - B2
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Mind Map on Edexcel - B2, created by loisadamsx on 03/02/2015.
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loisadamsx
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loisadamsx
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Resource summary
Edexcel - B2
Topic One - Genes and Enzymes
Cells and Microscopy
Pant and Animal cells have similarities and differences
Similarities:
Nucleus - Contains DNA, controls what the cell does
Cytoplasm - gel-like substance where most reactions happen
Cell Membrane - holds cell together, controls what enters and leaves
Mitochondria - where most respiration takes place
Differences - only plant cells
Rigid Cell Wall - made of cellulose, provides support
Large Vacuole - contains cell sap
Chloroplasts - where photosynthesis occurs, contain chlorophyll
Bacterial Cells
They are much smaller than plant or animal cells
Chromosomal DNA - one long circular chromosome, controls activities and replication, floats free in cytoplasm
Plasmids - small loops of extra DNA, contains genes for things such as drug resistance, passed between bacterial
Flagellum - hair like structure that rotates to move the cell
Cell Wall - provides support for the cell
Cells are studied using microscopes
Light microscopes - 1590s, see nuclei, chloroplasts, mitochondria
Electron microscopes - 1930s, smaller things in more detail, internal structure of mitochondria and chloroplasts, plasmids
Calculate magnification - length of image/length of specimen
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