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7.2 – The Plasma Membrane

Learn about the role of the plasma membrane in maintaining homeostasis and cell reproduction in both prokaryotic and eukaryotic cells. Understand how the plasma membrane allows selective permeability and acts as a boundary between the cell and its environment. Explore the basic structure of the plasma membrane and the importance of proteins, cholesterol, and carbohydrates in cellular function.

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7.2 – The Plasma Membrane

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  1. 7.2 – The Plasma Membrane State Standard SB1a Explain the role of cell organelles for both prokaryotic & eukaryotic cells, including the cell membrane, in maintaining homeostasis & cell reproduction.

  2. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Homeostasis • Living cells maintain a ____________ between materials ____________ & ____________ the cell. • Their ability to maintain this balance is called ____________. • It is important for a cell to control internal & external concentrations of ____________, ____________, & other nutrients, while eliminating cellular ____________.

  3. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Plasma Membrane • Thin, flexible ____________ between the cell and its environment • Allows ________________________ the cell • Allows ____________ to ____________ the cell

  4. Property of the membrane that allows certain materials to ____________ ____________ the cell while keeping others ____________ Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Selective Permeability • It also allows ____________ cells to perform different activities within the ____________ organism. • Example: Human nerve cells respond to a certain chemical that is present in the bloodstream. Other cells are exposed to this chemical but are not affected by it.

  5. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Basic Structure of the Plasma Membrane • The plasma membrane is composed of the ____________ ____________. • A phospholipid molecule is composed of a ____________ backbone, two fatty acid ____________, and a ____________ group.

  6. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Basic Structure of the Plasma Membrane Cont’d • The ____________, phosphate head of a phospholipid molecule is ____________. • The ____________, fatty acid tail of a phospholipid molecule is ____________.

  7. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Fluid Mosaic Model • The phospholipid bilayer allows other molecules to “____________” in the membrane. Other Components • Class Discussion: What is the meaning of the word mosaic? • Proteins • Cholesterol • Carbohydrates

  8. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Proteins • ____________ signals inside the cell • Act as a ____________ structure • Provide ____________ for substances to enter and leave

  9. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Cholesterol • ____________ fatty acid tails from ____________ together Review: What macromolecule group to cholesterols belong to?

  10. Cellular Structure and Function Chapter 7 7.2 The Plasma Membrane Carbohydrates • ____________ chemical ____________

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