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cell membrane.pptx

  1. • Where can you find membranes in a cell?
  2. Membranes are found around the cell and each organelle
  3. • The cell boundary; separates cellular materials from external environment • Regulates which materials can enter and exit the cell • Maintains homeostasis in cell
  8. Semipermeable membranes • Membranes that allow certain materials to pass through based on certain properties –size –hydrophobicity –charge
  9. The Fluid Mosaic Model: The membrane is made up of many smaller parts and the structure moves like a fluid
  10. Phospholipids and proteins make up most of the membrane. Cholesterol helps with flexibility, and carbohydrate chains help communicate with other cells
  11. A phospholipid is a type of lipid that has 2 fatty acid tails and a phosphate head. • rial/cellmembranes/ The phosphate head is hydrophilic because it is attracted to water The fatty acid tails are hydrophobic Because they are repelled by water Use E-Life animation 6.3 qX8
  12. The phospholipid bilayer forms because the inside and outside of the cell are mostly water:
  13. Assignment 1. What are the features of the fluid mosaic model of cell membranes? 2. How do you describe the cell membrane’s selective permeability property? 3. What are the various types of proteins and their functions in the cell membrane? 4. Describe the role of the cholesterol in the cell membrane.
  14. • Membrane receptor proteins relay signals between the cell’s internal and external environments. • Transport proteins move molecules and ions across the membrane. They can be categorized according to the Transporter Classification database. • Membrane enzymes may have many activities, such as oxidoreductase, transferase or hydrolase.
  15. • Cell adhesion molecules allow cells to identify each other and interact. • Cell surface markers are proteins that identify the cell type and the tissue of origin.
  16. • Integral membrane proteins are permanently embedded within the plasma membrane. They have a range of important functions, such as acting as channels, carriers, receptors, enzymes, or structural components2. • Peripheral membrane proteins are temporarily attached to the membrane or to integral proteins by weak interactions. They are often involved in cell signaling, cell recognition, or enzymatic activity2
  17. • Lipid-anchored proteins are covalently attached to a lipid molecule that is inserted into the membrane. They can be either on the inner or outer surface of the membrane. They are involved in various cellular processes, such as cell signaling, cell adhesion, or membrane trafficking3