Prepare confidently for the AP Biology exam by downloading this PDF resource BUNDLE today and mastering Unit 4 - Cell Communication and Cell Cycle. This resource covers Unit 4, including Cell Communication, Introduction to Signal Transduction, Signal Transduction, Changes in Signal Transduction Pathways, Feedback, and Mitosis, Cell Cycle and Cell Cycle Regulation.1. AP Biology Unit 4 Multiple Choice Question Bank (50 Questions):Enhance your understanding of cell communication and the cell cycle