Each of the following is a step in the epinephrine–cAMP pathway in which the signal is amplified except
A) receptor activation of G-protein.
B) G-protein activation of adenylyl cyclase.
C) adenylyl cyclase production of cAMP.
D) protein kinase A phosphorylation of target proteins.
Answer: B
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The digestive system is considered a natural nonspecific defense system against microorganisms as a result of:
a. the esophagus produces acid that kills mi-croorganisms prior to establishing a ga-strointestinal infection. b. the peristalsis of the intestines prevents attachment of organisms that are capable of surviving the acidic pH of the stomach. c. most organisms are resistant to the diges-tion by normal gastrointestinal secretions. d. the organisms are killed by exposure to saliva and pancreatic secretions before and after leaving the stomach.
Four of the five answers listed below are
characteristics of ethylene. Select the EXCEPTION.
a. a source is aging plant tissues b. promotes fruit ripening c. triggers cells division d. is a gas e. inhibits cell elongation
Incompatibility in the Rh blood system can result in hemolytic disease of the newborn. Which combination poses the greatest risk?
a. Rh positive mother, Rh negative fetus b. Rh positive father, Rh negative fetus c. Rh negative mother, Rh positive fetus d. Rh negative mother, Rh negative fetus e. Rh positive mother, Rh negative father
A common tissue between the fetus and the endometrium that provides nourishment to the developing fetus is the ________
Fill in the blank(s) with correct word