Cell Structures and their functions Cell Structure Cell membrane structure Organelles • ➢ Specialized structures in cells that perform specific functions. • Example: nucleus, mitochondria and ri... bosomes • • Cytoplasm ➢ a jelly-like substance that holds organelles. Cell membrane The Fluid – mosaic model is the model used to describe the cell membrane structure. The membrane contains phospholipids, cholesterol, proteins and carbohydrates. Phospholipids form a bilayer. Phospholipids contain 2 regions: polar and nonpolar. Phospholipid structure ➢ Also termed the plasma membrane. ➢ A structure that encloses the cytoplasm. • • • A phospholipid molecule has a polar head region that is hydrophobic and a nonpolar tail region that is hydrophobic. The polar region is exposed to water around the membrane. The nonpolar region is facing the interior of the membrane. Functions of the cell • • • • • Smallest unit of life Cell metabolism and energy use. Synthesis of molecules. Communication. Reproduction and inheritance. Movement through the cell membrane • Cell membrane • • • • The cell membrane is the outermost component of a cell. It forms a boundary between material in inside the cell and the outside. Materials inside the cell are intracellular and those outside are extracellular. It acts as a selective barrier. • • 1 The cell membrane has selective permeability, which allows only certain substances to pass in and out o ... Purchase document to see full attachment [Show More]
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