Describe briefly the characteristics necessary that determine cell to cell

signaling.

2. Briefly describe the features that are in common to the specific

molecular components of the various signal transduction pathways.

3. Define the term “gated” and how do they operate?

4. Briefly describe the sequence of events when acetylcholine acts as a

neurotransmitter

5. What makes steroid hormones unique in their ability to act as signaling

molecules?

6. What shared characteristics do “G-proteins” share amongst each other?

7. If signal binding to a receptor serves as a switch that sets cellular events

in motion, what mechanisms turn the pathway off? Describe briefly!

8. Describe what is meant by “cross-talk?”

9. What is the effect of elevated cAMP levels?

10. What is the significance of “phosphorylation transcriptional

activators?”