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Transcript
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. Chapter 7 Cellular Structure and Function 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 ____________. Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Plasma Membrane Thin, flexible ____________ between the cell and its environment Allows ____________ ____________ the cell Allows ____________ to ____________ the cell Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Selective Permeability Property of the membrane that allows certain materials to ____________ ____________ the cell while keeping others ____________ 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. Chapter 7 Cellular Structure and Function 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. Chapter 7 Cellular Structure and Function 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 ____________. Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Fluid Mosaic Model The phospholipid bilayer allows other molecules to “____________” in the membrane. Other Components Proteins Cholesterol Carbohydrates Class Discussion: What is the meaning of the word mosaic? Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Proteins ____________ signals inside the cell Act as a ____________ structure Provide ____________ for substances to enter and leave Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Cholesterol ____________ fatty acid tails from ____________ together Review: What macromolecule group to cholesterols belong to? Chapter 7 Cellular Structure and Function 7.2 The Plasma Membrane Carbohydrates ____________ chemical ____________