Memory Microbiology chapter 3Versión en línea Cell structure por misael Lopez Gram negative - a fluid mosaic made up of three types of organic molecules. - a semipermeable membrane surrounding the cytoplasm of a cell A dense gelatinous matrix composed of 70% to 80% water. the site for most of the enzymatic reactions and metabolic activity of the cell. Cytoskeleton Cell membrane Bacterial cell wall Very dynamic and capable of reorganization. Helps cells maintain their shape - identifies bacteria as either gram stain positive or negative Cytoplasm - thick peptidoglycan layer, external to plasma membrane. Cell wall •Structural support •Transport of molecules •Receptors for hormones •Surface antigens - Thin peptidoglycan layer in the periplasmic space - large periplasmic space Gram positive Plasma Proteins Helps maintain the shape of a cell externally and protects it from physical or chemical damage. A rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria.
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