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Signal Amplification

View the animation below, then complete the quiz to test your knowledge of the concept.






1An example of a second messenger is
A)AMP.
B)ATP.
C)cAMP.
D)cATP.
E)adenylyl cyclase.



2Arrange the following in the proper order in which they occur during signal amplification.

1. Activation of protein kinase
2. Activation of G protein
3. Activation of adenylyl cyclase
A)1, 2, 3
B)2, 1, 3
C)2, 3, 1
D)3, 2, 1
E)3, 1, 2



3Which of the following statements about signal amplification is TRUE?
A)A single cell surface receptor can activate only one G protein.
B)A single cell surface receptor can activate only two G proteins.
C)A single cell surface receptor can activate many G proteins.
D)It takes two cell surface receptors to activate a single G protein.
E)It takes many surface receptors to activate a single G protein.



4Most signaling molecules are found in low concentrations inside the cytoplasm.
A)True
B)False



5Cell surface receptors may be enzyme-linked or G protein-linked.
A)True
B)False







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