A gap junction forms when opposing membrane-spanning proteins called ________ on two adjacent cells unite, creating a protein channel that is capable of opening and closing.
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Q17: Usually, cytokine binding activates
A) JAK kinase.
B) tyrosine
Q18: Second messenger molecules directly
A) change the regulation
Q19: Cells that respond to signals are usually
Q20: Diacylglycerol is produced from
A) cyclic AMP.
B) phospholipase
Q21: A chemical that is secreted by a
Q23: All molecules secreted by nerve cells (neuromodulators,
Q24: If the concentration of an endocrine ligand
Q25: A few gases are known to act
Q26: Before nitric oxide was identified, its action
Q27: To maintain _, the body uses a
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