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1.2 Ultrastructure of CellsDP Biology
R. Price
v. 1 2015
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#1 Prokaryotes have a simple cell structure without compartments
• Prokaryotes do not have a nucleus
• Cell membrane present
• Cell wall has peptidoglycan
• 70S ribosomes
• Area of cytoplasm that looks lighter = nucleoid (DNA, but not nucleus)
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#2 Eukaryotes have a compartmentalized cell structure
• Eukaryotes have a nucleus
• Eukaryotes have organelles
• Organelles have specialized functions
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#3 Prokaryotes divide by binary fission
• Asexual reproduction
• Single circular chromosome replicates
• A copy moves to each end of the cell
• Cell divides
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#4 Electron microscopes have a much higher resolution than light microscopes
Max light microscope resolution .2µm
Red and white blood cells
Max electron microscope resolution .001µm
Red and white blood cells
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Sources
ContentAllott, Andrew, and David Mindorff. Biology: Course Companion. 2014
ed. Oxford: Oxford UP, 2014. Print. Oxford IB Diploma Programme.
Walpole, Brenda. Biology for the IB Diploma. 2nd ed. Cambridge: Cambridge UP, 2014. Print.
Images
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