#Question id: 1121
#Unit 4. Cell Communication and Cell Signaling
Which of the following provides the best evidence that cell-signaling pathways evolved early in the history of life?
#Question id: 1122
#Unit 4. Cell Communication and Cell Signaling
In endocrine signaling, the signaling molecule.
#Question id: 1123
#Unit 4. Cell Communication and Cell Signaling
Epinephrine can be what kind of signaling molecule?
a. autocrine b. direct contact c. endocrine d. paracrine
#Question id: 1124
#Unit 4. Cell Communication and Cell Signaling
Which of the following is (are) intracellular second messengers?
a. Ca2+ b. cAMP c. epinephrine
d. protein kinase A e. protein kinase C
#Question id: 1125
#Unit 4. Cell Communication and Cell Signaling
Examples of G protein–coupled receptors include
a. rhodopsin receptor. b. β-adrenergic receptor.
c. insulin receptor. d. acetylcholine receptor.
#Question id: 1126
#Unit 4. Cell Communication and Cell Signaling
Which of the following statement(s) is (are) true of the α subunit of a G protein?
a. It physically associates with the receptor.
b. It binds GDP.
c. It binds GTP.
d. It is a transmembrane protein.