Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?
A. TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans.
B. The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans.
C. Viroids are the likely cause of TSEs.
D. TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases.
E. Infectious TSE preparations do not seem to contain DNA or RNA.
C. Viroids are the likely cause of TSEs.
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The function of the glycoprotein spike on some viruses is to:
a. allow viral entry into the host cell. b. protect the nucleic acid. c. prevent drying out and the destruction of the virus. d. stabilize attachment for the lipid envelope.
In a strand of DNA, a cytosine base has been replaced by guanine. What kind of mutation has occurred?
a. frameshift mutation b. transition substitution c. transversion substitution d. translocation
Trakr, the Ground Zero hero dog, was cloned in the hope that _____
a. his clones would be adopted as pets b. his clones would be better search and rescue dogs as he was c. he would be the world's first cloned mammal d. his clones would be just as good search and rescue dogs as he was e. he would be brought back to life
EcoRI and HindIII are
A. DNA polymerases. B. restriction endonucleases. C. ligases. D. reverse transcriptases. E. palindromes.