Which of the following statements concerning prion diseases is true?
a. Normal host cellular prion proteins (PrPC) are converted into scrapie proteins (PrPSc).
b. Prion diseases affect humans but not other animals.
c. Prion diseases affect brain function but do not affect the morphology (overall appearance) of brain tissues.
d. Prion diseases are always inherited.
Ans: a. Normal host cellular prion proteins (PrPC) are converted into scrapie proteins (PrPSc).
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Facilitated diffusion of magnesium ions (Mg++) would occur out of a cell if the Mg++ concentration was ________ outside the cell than inside, and ________.
A) higher; Mg++ could move directly through the phospholipid bilayer of the membrane B) lower; Mg++ could move directly through the phospholipid bilayer of the membrane C) the same; Mg++ could move directly through the phospholipid bilayer of the membrane D) higher; Mg++ could move through a transport protein across the membrane E) lower; Mg++ could move through a transport protein across the membrane
What is the equilibrium value of F for a population of constant size Ne = 5,000 that ex-periences a mutation rate of 0.00005?
a. 0 b. 0.15 c. 0.30 d. 0.50 e. None of the above
AT-rich DNA will denature/melt
A) at a higher temperature than GC-rich DNA. B) at a lower temperature than GC-rich DNA. C) usually at the same temperature as GC-rich DNA, with some minor variations. D) in accordance with the animal or plant from which it was taken.
Haustoria
A. are a form of parasitic protozoan. B. refers to the reproductive structure formed by slime molds. C. are specialized hyphae used by parasitic fungi. D. are the reproductive form of protozoans.