Polycyclic aromatic hydrocarbons in tobacco smoke are potent carcinogens because they preferentially bind to, and trigger base substitutions, in the
A) Ras gene.
B) p53 gene.
C) Raf gene.
D) PTEN gene.
E) EGF receptor gene.
Answer: B
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What is one of the ways plants overcome dispersal issues associated with vegetative reproduction?
A. Horizontal stems grow away from the parent, allowing new shoots to grow at a distance from the parent. B. Specialized seed coats can enable wind dispersal. C. Fruits encourage animal-assisted dispersal. D. Plantlets cluster near the parent plant. E. Plant dispersal is not an issue for vegetatively reproducing plants.
What structures of the male and female reproductive systems do not share a common embryonic origin?
A. labia majora and scrotum B. labia minora and urethra C. clitoris and penis D. cervix and ejaculatory duct E. All of these pairs share a common embryonic origin.
The most common mode of transmission for sinusitis is ________.
A. direct contact B. endogenous infection C. droplet contact D. indirect contact E. exotoxin
What is the goal of angiogenesis inhibitors?
A. They inhibit the synthesis of HER1 proteins on cancerous cells. B. They inhibit the formation of small blood vessels that feed a tumor. C. They prevent the activation of protein kinases in the cell. D. They target the Ras protein, causing it to stop promoting cell division. E. All of the choices are correct.