1. Small molecules often serve as chemical signals. These include neurotransmitt
ID: 3504827 • Letter: 1
Question
1. Small molecules often serve as chemical signals. These include neurotransmitters that are used in the nervous system (Chapter 11) and hormones of the endocrine system (Chapters 17 and 18). Any small molecule that binds a much larger one, notably a protein, is called a(n):
A.ligand.
B.responder.
C.isotope.
D.receptor.
E. communicator.
2. This leads to the important point that how a cell responds to a ligand is determined by the receptor type it possesses. You will learn more about G protein receptor function in Chapter 17. Which of the following is not true after a G protein-type receptor binds its ligand?
A.The cell may be stimulated to open ion channels in the plasma membrane.
B.All of the preceding are events that result or may result upon ligand binding to the receptor.
C.The receptor binds to a G protein complex.
D.The cell may be stimulated to activate one or more intracellular signal pathways.
E.The cell may be stimulated to activating enzymes associated with the plasma membrane.
3.
Explanation / Answer
1. Small molecule often serve as chemical signals. These include neurotransmitter that are used in the nervous system and hormones of the endocrine system any small molecule that binds a much larger one is called receptor i.e ligands binds with receptor.
2. B all of the preceding are events that result or may result upon ligand binding to the receptor.
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