A patient is complaining of erectile dysfunction. Based on what you know about the physiology of erections, what likely cause will you look for in your workup?
A. Excessive caffeine consumption
B. Atherosclerosis
C. Damage to the baculum
D. Damage to the vas deferens
B. Atherosclerosis
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The Treponema pallidum of syphilis can be transmitted by
A. sexual or oral contact. B. contact with contaminated objects. C. clothing. D. the fecal-oral route.
RNA is characterized by which one of the following features?
A. Deoxyribose B. Thymine C. Ribose D. Double-stranded
Which of the following statements best summarizes the differences between RNA and DNA?
a. RNA is a protein and DNA is a nucleic acid. b. DNA is a polymer and RNA is a monomer. c. DNA comprises the genes, while RNA is a direct participant in the process of protein synthesis. d. RNA is a single-stranded form of DNA. e. DNA is the primary energy currency of all cells.
A therapeutic index is a ratio between
A) toxicity versus half-life. B) potential patients not ruled out due to drug interactions or contraindications versus patients that experienced side effects. C) maximum safe dose versus minimum effective dose. D) patient survivability versus patient allergies. E) patients that benefited from drug versus patients that experienced side effects.