People with the genetic disease xeroderma pigmentosum have compromised DNA repair mechanisms, making them extremely sensitive to genetic damage from sunlight
Without taking measures to minimize exposure, these individuals typically succumb to skin cancer in childhood or early adulthood–a demonstration of the mutagenicity of ultraviolet radiation. Yet, deliberate exposure in the form of sunbathing is very popular with some segments of the population. Why do you think this is so, and how might public health professionals raise awareness of the danger in which these people place themselves?
The reasons for the popularity of sunbathing in some groups are probably numerous and complex, but generally relate to the wish to project a culturally conditioned image of health and vigor. This is ironic in that the practice actually causes genetic damage–decreasing health and vigor. Health professionals might try to combat this practice with advertising campaigns highlighting the effects of genetic damage, perhaps along the lines of the campaigns against cigarette smoking.
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The A bands in skeletal muscle are composed of ____
a. discs to which thin filaments are anchored b. stacked thick filaments along with the parts of thin filaments that overlap both ends c. thin filaments but no thick filaments d. thick filaments but no thin filaments e. stacked thin filaments along with parts of thick filaments that overlap both ends
Which of the following produce N-formylmethionine as their first amino acid in protein synthesis?
a. Mercaria b. Archaea c. Bacteria d. Eukarya
Impetigo is due to an infection caused by
A) Staphylococcus aureus but not Streptococcus pyogenes. B) Streptococcus pyogenes but not Staphylococcus aureus. C) either Staphylococcus aureus or Streptococcus pyogenes. D) neither Staphylococcus aureus nor Streptococcus pyogenes.
Gene regulation can occur at which of the following steps in the path from DNA to protein?
A. during transcription from a chromosome B. during translation from DNA to RNA C. after protein synthesis D. during transcription from a chromosome and during translation from DNA to RNA E. during transcription from a chromosome, during translation from DNA to RNA and after protein synthesis