1. Dr. Alvin Fox The external layers of vegetative cells and spores

2. KEY WORDS Cell envelope Teichoic acid Cell wall Teichuronic acid Cell membrane Lipoteichoic acid Outer membrane Mycolic acid Peptidoglycan Undecaprenol (bactoprenol) Braun lipoprotein Endospore (spore) Porins Cell division Lipopolysaccharide

5. Bacterial cell envelopes Gram stain (+ or -) correlates with structure

6. Gram positive Gram negative

10. Peptidoglycan Muramic acid Glucosamine L-alanine D-glutamic acid L-lysine/Diaminopimelic acid D-alanine D-alanine

14. Gram Positive Cell Envelope Cytoplasm Lipoteichoic acid Peptidoglycan-teichoic acid Cytoplasmic membrane r r r r r r r r r r

18. Gram Negative Cell Envelope Cytoplasm Inner (cytoplasmic) membrane Outer Membrane Lipopolysaccharide Porin Braun lipoprotein Peptidoglycan

19. Acid Fast Cell Envelope Cytoplasm Peptidoglycan-mycolic acid-arabinogalactan Cytoplasmic membrane Mycolic acid lipids r r r r r r r r r r

20. Peptidoglycan synthesis Cytoplasm Cell wall undecaprenol sugar amino acid Cell Membrane 1 2 3

24. Vegetative cell division Sporulation

25. The endospore cortex exosporium coat Inner membrane outer membrane