After a steroid hormone binds its receptor, the hormone-receptor complex then:a
activates a G protein.
b. activates a protein kinase.
c. activates adenylyl cyclase.
d. activates calmodulin.
e. binds DNA.
E
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The buccal cavity is another name for the:
A. mouth. B. stomach. C. rectum. D. small intestine. E. anus.
How does sickle cell anemia reduce the blood’s ability to deliver oxygen to tissues?
a. The plasma membrane is too thick to allow oxygen to diffuse into sickle-shaped red blood cells. b. Sickle-shaped red blood cells puncture normal red blood cells, causing them to rupture and lose hemoglobin. c. Deformed red blood cells clog capillaries, preventing other red blood cells from passing through. d. Sickle cells contain a mutated form of hemoglobin that binds to half as many oxygen molecules.
Sudan IV, a dye that binds to nonpolar molecules, is used to detect the presence of macromolecules in food. Sudan IV would test positive in the presence of what macromolecule?
A. starch B. chitin C. DNA D. fats E. hemoglobin
All living organisms can be divided into four nutritional classes based on how they obtain which two resources?
A. nitrogen and carbon B. oxygen and nitrogen C. carbon and energy D. carbon and oxygen