As a scientist working for an antibioterrorism task force, you are asked to evaluate some biological samples for the presence of Yersinia pestis, the organism that causes the plague. After confirming that the samples do contain Y. pestis, you instruct your team to begin sequencing the strain. Since the genome sequence of Y. pestis is already known, why would sequencing this strain be useful?
A. to create a vaccine for this particular strain
B. to help determine the source of the strain, and learn whether it has been genetically engineered
C. to establish the course of infection, and determine whether the strain is altered by causing infection
D. to provide better data for the genome database
Answer: B
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a. 4?2?3?1?5 b. 1?4?3?2?5 c. 5?2?1?4?3 d. 3?4?5?2?1 e. 3?2?1?5?4
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Two strands of DNA that have been cut by an endonuclease can be sealed together by a(n)
A. polymerase enzyme. B. ligase enzyme. C. exonuclease enzyme. D. protease enzyme. E. methylase enzyme.
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