1. Phospholipids have a polar head
and non-polar tails
Phospholipids have a amphipathic property, meaning they are both polar and non-polar

2. Phospholipid structures
Remember, their fatty acid tails are non-polar and hydrophobic. These phospholipids can arrange themselves in a micelle, liposome, or bilayer

6. How did early cell biologists deduce membrane structure from electron microscopic images and the knowledge that membranes were lipoprotein complexes?
Note the material projecting from the plasma membrane both inside and outside of the cell.  What do you think this is?  Also, outside of the cell is in the upper half of photo. Can you find a vesicle with a unit membrane structure?

7. Plasma Membrane Functions: Protection Maintain homeostasis
Plasma Membrane Functions:
Protection
Maintain homeostasis
Regulate transport in and out of cell or organelles
Allow selective transport of nutrients, gases and wastes
Involved in cell-cell communication via receptors that bind signaling molecules
Provide anchoring sites for cytoskeletal filaments or components of the extracellular matrix. This allows the cell to maintain its shape and perhaps move to distant sites.
Help compartmentalize the cytosol
Regulate the fusion of the membrane with other membranes in the cell 
Provide a passageway across the membrane for certain molecules
Allow directed cell or organelle motility