1Bacterial Structure and Function 1TopicsProkaryotic Structure & Function(The External Structures)• Small is Beautiful (and efficient)• Microbial shapes and sizes• The Cell Wall • Flagella, Pili & Fimbrae• Capsules, Slime and S-layers
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2The Important (Exam) Stuff•Describe the range of sizes of bacteria and the importance of being small.•Explain how different bacterial shapes are often included in bacterial names.•Describe the basic structure of peptidoglycan. •Explain the major structural differences between the cell walls of Gram-negative and Gram-positive bacteria.•Describe different flagella distribution patterns.•Explain the difference between fimbriae and pili as well as the difference between capsule, slime and S-layers.The Importance of Being Smallr=1 μmsurface area = 4πr2=12.6 μm2volume = 1/3πr2= 4.2 μm3surface/volume = 3r=2 μmsurface area = 4πr2=50.3 μm2volume = 1/3πr2= 33.5 μm3surface/volume = 1.5