Unit 4: Cell Communication and Cell CycleAP BiologyOverviewCell communication: how cells talk to each otherSignal transduction pathwaysFeedback mechanismsThe cell cycleCell cycle regulation and cancerVocabularyUnit 4 topicsUnit 4 overview4.1Cell Communication4.2Introduction to Signal Transduction4.3Signal Transduction4.4Changes in Signal Transduction Pathways4.5Feedback4.6Cell Cycle4.7Regulation of Cell Cycle← Previous3.6 Cellular RespirationNext →4.1 Cell CommunicationPractice AP Biology questions →