Multiple Choice
The transcription of new messenger RNA is a function of __________.
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What is the role of G proteins in GPCR signaling?
cAMP, IP3, and DAG are all molecules that are used as secondary messengers. Which statement below correctly identifies a difference between the pathways in which they are found?
Cyclic AMP functions as a second messenger to:
(a) Build proteins and catalyze specific reactions
(b) Activate adenylate cyclase
(c) Open ion channels and activate key enzymes in the cytoplasm
(d) Bind the hormone–receptor complex to DNA segments
Hormones can bring about substantial physiological changes at very low concentrations. How does this relate to the concept of second messenger systems?