CELL QUESTION 1983:				L. PETERSON/AP BIOLOGY
	Describe the fluid-mosaic model of a plasma membrane. Discuss the role
	of the membrane in the movement of materials through by each of the
	following processes.
	  	a.  Active Transport
	  	b.  Passive Transport

  
  STANDARDS:
  
  FLUID-MOSAIC MODEL:              Max. = 9 points
  __  Singer/Nicholson or "differs from" Davson/Danielli
  __  Dynamic
  __  Phospholipid Bilayer
  __  Hydrophilic heads/hydrophobic tails and explanation
  __  Polar/Nonpolar
  __  Proteins - intrinsic/extrinsic
  __  Permeases (active + passive)
  __  Pores or apertures
  __  Functional "R" Groups
  __  Glycoproteins or carbohydrates (recognition)
  __  Diagrams appropriately used with explanation
  __  Selectivity
  
  TRANSPORT                   Max = 9 points
  
  PASSIVE TRANSPORT:
  __  Definition of Diffusion
  __  Osmosis
  __  Size of molecule / polarity
  __  Facilitated Diffusion
  __  Function of pores
  
  ACTIVE TRANSPORT:
  __  Definition
  __  ATP
  __  ATPase
  __  Na+/K+  Pump
  __  Substances diffuse in-need transport out
  __  Carrier molecules and specificity