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Cell Membrane Structure and Function: An Overview

This lesson explores the structure and functions of cell membranes, including their composition, the fluid mosaic model, and the selective permeability of molecules. It also covers the transmission of chemical signals through receptors on the cell membrane.

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Cell Membrane Structure and Function: An Overview

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  1. The student is expected to: 3E evaluate models according to their limitations in representing biological objects or events; 4B investigate and explain cellular processes, including homeostasis, energy conversions, transport of molecules, and synthesis of new molecules;

  2. (Continued) 9A compare the structures and functions of different types of biomolecules, including carbohydrates, lipids, proteins, and nucleic acids

  3. KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

  4. Cell membranes are composed of two phospholipid layers.

  5. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions.

  6. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. • forms a boundary between inside and outside of the cell outside cell inside cell

  7. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. • forms a boundary between inside and outside of the cell • controls passage of materials outside cell inside cell

  8. Cell membranes are composed of two phospholipid layers.

  9. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer.

  10. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane.

  11. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane. • The fluid mosaic model describes the membrane.

  12. Cell membranes are composed of two phospholipid layers.

  13. Cell membranes are composed of two phospholipid layers. • The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.

  14. Cell membranes are composed of two phospholipid layers. • The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.

  15. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors.

  16. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor

  17. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor • membrane receptor

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