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1.2 Ultrastructure of CellsDP Biology
R. Price
v. 1 2015
Allott 16
#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
#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
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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