Who first demonstrated transformation using mice and two strains of Streptococcus pneumoniae?
A. Griffith
B. Watson and Crick
C. Avery, McCarty, and MacLeod
D. Hershey and Chase
E. Jacob and Monod
Answer: A
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Treatment of eukaryotic cells with bacterial polypeptide actinomycin D will cause:
A. interference with the movement of tRNAs during polypeptide elongation on the ribosome. B. blockage of splicing as mediated by snURP2. C. no change; bacterial proteins will have no impact on the function of eukaryotic cells. D. interference with transcript elongation by RNA polymerase II.
A home-schooled child recently visited an ailing great-grandparent who was complaining of a painful rash. Even though the child had had no contact with children suffering from chickenpox, the child developed chickenpox. How did the child contract the infection?
A. The virus was likely contracted from fomites. B. The adult had chickenpox and exposed the child. C. An insect vector infected the child. D. The adult had shingles and the child was exposed to virus particles. E. There is insufficient information for a conclusion.
The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is
A) Degermination B) Sanitization C) Sterilization D) Disinfection E) Antisepsis
What enzyme is responsible for transcription (formation of mRNA)?
A. helicase B. DNA polymerase C. RNA polymerase D. protease E. ligase