The document lists factors affecting cell migration, with specific options that could block this ability. Key factors include identical cytoskeletal arrangements, lack of protrusion and contraction, lack of cell polarization, and activation of rac in the front. It concludes that all listed options would hinder cell migration.

1. Which of the following would block a cells ability to migrate?
A. The cytoskeletal arrangements in the front and back of the cell are identical
B. Protrusion at the front, contraction at the rear of the cell
C. Cell polarization
D. Activation of Rac in the front of the cell
E. All of the above would block migration