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