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.

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 ____________. 7.2 The Plasma Membrane Cellular Structure and Function Chapter 7

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

Selective Permeability Cellular Structure and Function  Property of the membrane that allows certain materials to ____________ ____________ the cell while keeping others ____________ 7.2 The Plasma Membrane Chapter 7  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.

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

Cellular Structure and Function 7.2 The Plasma Membrane Chapter 7 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 ____________.

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

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

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

Carbohydrates Cellular Structure and Function  ____________ chemical ____________ 7.2 The Plasma Membrane Chapter 7