1. When considering tight junctions, adherens junctions, and desmosomes:  a. Which ones do not help in resisting mechanical stress and holding cell shape? Why not?  b. Considering how the mechanical junctions are placed in the plasma membrane, why don’t they provide a truly sealed barrier?

1. List four classes of membrane-associated proteins and briefly describe the differences between them. 2. What are 3 types of modifications that can anchor proteins to the membrane? How do they link to the proteins they anchor?

Match the following with the term that best describes them                                                             integral part of the plasma membrane                                                             can easily cross the semi-permeable plasma membrane                                                             cellular currency of cell that enables it to transport molecules against the concetration gradient (i.e active transport)                                                             act as channels carriers to transport polar molecules like sugars into cells A. phospholipids B. proteins C. ATP D. oxygen