In the mid-1970s a group of scientists asked the National Academy of Sciences to appoint a panel to assess the risks of
recombinant DNA technology and the need to control its associated research. Summarize the most important lesson
learned from this event. What will be an ideal response?
ANSWER: The most important lesson from these events is that the scientists who developed the methods
were the first to call attention to the possible dangers of recombinant DNA research, and they
did so only based on its potential for harm. There were no known cases of the release of
recombinant DNA–carrying host cells into the environment. Scientists voluntarily shut down
their research work until the situation could be assessed properly and objectively. Only when
they reached a consensus that there was no danger did their work resume.
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Some animals allow their body temperature to conform to the environment. What is the old term for these animals, and what is the newer preferred term?
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a. carbon b. radium c. iodine d. thallium e. cobalt
The appearance of gram-negative bacteria after completing the Gram stain.
a. Purple b. Red c. Colorless d. Brown