As people age, they often have trouble seeing near objects. This farsightedness is treated by
A. cataract surgery.
B. wearing concave lenses to refocus the image on the retina.
C. wearing convex lenses to refocus the image on the retina.
D. radial keratotomy.
E. an unevenly ground lens to compensate for an uneven cornea.
Answer: C
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If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body. B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported throughout his body. C. The concentration of oxygen would be the same in red blood cells and blood plasma.
What is the difference in prokaryotic vs. eukaryotic mRNA?
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The drug used for several protozoan infections is
A) Sulfa drugs B) Nystatin C) Griseofulvin D) Amphotericin B E) Metronidazole