What is one mechanism by which a mutation can cause melanoma?
A) by the production of an altered BRAF protein that keeps melanocytes moving through the cell cycle
B) by causing the accumulation of Huntington protein in melanocytes, which keeps them moving through the cell cycle
C) by causing the accumulation of altered BRAF protein in germ-line cells
D) by preventing the BRAF protein from being able to repair damaged DNA
Answer: A
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A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins. B. The shape change could induce scrapie protease activity. C. The shape change could stop the transcription of scrapie RNA. D. The shape change could stop the replication of scrapie DNA. E. The shape change could block the translation of scrapie RNA.
The process during which potassium and hydrogen
ions, penicillin, and some toxic substances are put into the urine by active transport is a. tubular secretion. b. reabsorption. c. filtration. d. countercurrent multiplication. e. diffusion.
The two tissues of the eye with exposed surfaces susceptible to contamination are the ________ and the ________.
A. conjunctiva; lens B. cornea; iris C. conjunctiva; iris D. conjunctiva; cornea E. cornea; lens
A set of regulator genes is known to be very similar in both humans and flies. This fact is used to indicate what about the two species?
What will be an ideal response?