What is the function of a protein kinase?
A. To phosphorylate GDP to generate GTP
B. To remove phosphate groups from proteins
C. To cleave membrane phospholipids
D. To add phosphate groups onto proteins
Answer: D
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What is a cyclin?
A. a protein that activates kinases B. a protein whose levels change with the cell cycle C. a kinase D. Answers a and b are both correct.
You may have noticed that the prepackaged deli meats you purchase in the refrigerated section of the grocery store seem to last longer than the same meats purchased freshly sliced from the deli counter. You are puzzled because the meats are identical and you expect the products at the deli to be fresher. What is the primary reason the prepackaged meats last longer?
A. The prepackaged meats are typically sprayed with bacteriophage to prevent the growth of Listeria monocytogenes, which typically causes spoilage. B. The prepackaged meats are not handled by the deli workers. C. The prepackaged meats are stored at a much colder temperature than the deli case. D. The prepackaged meats have modified atmosphere packaging that has excluded oxygen gas, which would promote the growth of spoilage organisms.
Hutton's theory of geological change included all EXCEPT
A. sudden extinction of species due to sudden, widespread disasters. B. extreme geological change occurring over a long period of time. C. production of layers of sediment through slow deposition. D. slow cycles of erosion and uplift.
A patient presents with inflammation of the heart valves, fever, malaise, and subcutaneous nodules at joints. The recommended treatment is
A) supportive care. B) streptomycin. C) chloroquine. D) hyperbaric chamber. E) praziquantel.