This figure demonstrates a DNA repair mechanism. What property of DNA makes such repair possible in DNA but not RNA?
a. DNA uses deoxyribose instead of ribose.
b. DNA uses thymine instead of uracil.
c. DNA is a double helix.
d. DNA is more reactive than RNA.
C
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Immediately after an action potential passes along an axon, it is not possible to generate a second action potential. Thus, we state that the membrane is briefly _____
A) hyperexcitable B) refractory C) fully depolarized D) above threshold E) at the equilibrium potential
Which of the following methods can be used to create competent bacterial cells?
A) Treating the cells chemically B) Exposing cells to a strong electric field C) Making the cell membrane more permeable to DNA D) Allowing the culture to enter stationary phase growth E) A, B, and C only
All humans belong to the same species.
a. true b. false
A sample of the tissue from an inflamed, pus-filled area on the lower leg is treated with KOH and stained with GMS. Under the microscope golden brown spheres are visible. With what disease are these observations consistent?
A) pityriasis B) fungemia C) chromoblastomycosis D) mycetoma E) sporotrichosis