MICRO 302 Lecture Notes - Lecture 7: Lipid Bilayer, Cell Membrane, Periplasm

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Identify and draw the most common bacterial cell shapes. Compare the surface area to volume ratio of large cells and small cells. Surface area to volume ratio gets smaller as the cell gets larger. If the cell gets too large then it will not be able to absorb the proper amount of materials to actually accommodate the cells increase in size and the cell thus dies. Draw a phospholipid bilayer, identify the types of molecules that freely pass through this bilayer, and the function of this bilayer. Oxygen freely passes through and charged ions. Compare and contrast archaeal and bacterial membranes and identify mechanisms used to strengthen the membrane. Archaea have c-o-c ether links for strength and bacteria have sterols, like cholesterol, for moldability and protection. Small cells have a surface area to volume ratio. Location of many metabolic processes (respiration, photosynthesis) Gas vacuole: buoyancy for floating in aquatic environments.

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