Principles of Cell Signaling
Signals act over various distances, producing diverse responses.
Signals — act over long or short range?
Can diffuse locally or over large distances
Extracellular Signal Types
Includes hormones, local mediators, neurotransmitters, contact molecules.
Limited signals — diverse responses?
Yes, depend on cell type and pathways
Fast vs slow responses — difference?
Fast: milliseconds; Slow: hours
Cell surface receptors — role?
Detect signals, activate intracellular pathways
Signaling proteins — function?
Act as molecular switches via GTP/GDP binding
Feedback regulation — purpose?
Adjust signal strength and duration
G protein-coupled receptors — example?
A major receptor class that activates G proteins
Test your knowledge with 8 questions on Cell Signaling Fundamentals.
1. How do G-protein-coupled receptors (GPCRs) and enzyme-coupled receptors differ in their mechanisms of initiating intracellular signaling?
2. Which of the following cell surface receptor classes directly activate intracellular enzymes upon ligand binding?
Review the complete course in the revision sheet for Cell Signaling Fundamentals.
See revision sheet →Import your course and AI generates flashcards in 30 seconds.
Flashcard generator