ttack complex by the association of C9 protein subunits.

Name two functions each for actin and tubulin.

Explain the presence of the protein identified by peptide keratin, type I cytoskeletal ?

B. Some proteins shuttle back and forth between the nucleus and the cytosol. They need a nuclear export sequence to get out of the nucleus. How would they get into the nucleus? What gradient would this protein utilize and how does this gradient contribute to both nuclear import and export?

Explain the movement of indirect protein transport; where are the proteins made, where are they going (some examples for each destination). Remember there are soluble and insolubleproteins (membrane bound).

Describe how a carrier protein functions. What role do carrier proteins serve in the cell? Why are they necessary? Where might you find a carrier protein?

Describe the basic components of a plasma membrane and explain in detail the asymmetry that occurs in a red blood cell in terms of the membrane and the associated proteins.