Explain how the presence of only a few signal molecules can cause a major response. For example, one molecule of epinephrine causes millions of glycogen molecules to be converted to glucose molecules. A/ Question 23 (2 points) Cyclic AMP is a “second messenger” in signal transduction pathways. For the signaling system that involves epinephrine as a ligand, what directly activates cyclic AMP? GTP neurotransmitters Ca++ the enzyme adenylyl cyclase What is a cleavage furrow? O a ring of vesicles forming a cell plate the separation of divided prokaryotes a groove in the plasma membrane of a cell that is beginning cytokinesis in animal cells the metaphase plate where chromosomes attach to the spindle the space that is created between two chromatids during anaphase

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