Chapter 4. Functional Anatomy of Prokaryotic and Eukaryotic Cells. Definition of “prokaryotic”. Refers to organisms, typically 1-celled, having cells which : lack a nucleus lack membrane-bound organelles contain 1 chromosome may contain extra-chromomal DNA (plasmids)
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Functional Anatomy of
Prokaryotic and Eukaryotic
Refers to organisms, typically 1-celled, having cells which:
Make up peptidoglycan
Ok, not too bad – now for something completely different – Gram negative cell walls!
Gram neg. cell walls are composed of peptidoglycan AND an outer membrane; it is multi-layered!!
20-80 nm thick
Retains CV-I complex of Gram stain
Teichoic acid anchors cell wall to cell membrane and imparts a negative charge
Two part structure
Thin peptidoglycan (10-20 nm)
Outer membrane contains LPS
LPS imparts a negative chargeGram pos. vs Gram neg cell walls