Q: 1. Electrophoresis separates fragments of DNA according to ______. a
1. Electrophoresis separates fragments of DNA according to ______. a. sequence b. length c. species 2. PCR can be used __________. a. to increase the number of specific DNA fragments b. in DNA finger...
See AnswerQ: The graph shown in FIGURE 8.5 is reproduced from an
The graph shown in FIGURE 8.5 is reproduced from an original 1952 publication by Hershey and Chase. Bacteriophage were labeled with radioactive tracers and allowed to infect ba...
See AnswerQ: A person is declared dead upon the irreversible ceasing of spontaneous body
A person is declared dead upon the irreversible ceasing of spontaneous body functions: brain activity, blood circulation, and respiration. Only about 1 percent of a body’s cells have to die in order f...
See AnswerQ: Researchers looking for fossils of the earliest life forms face many hurdles
Researchers looking for fossils of the earliest life forms face many hurdles. For example, few sedimentary rocks date back more than 3 billion years. Review what you learned about plate tectonics (Sec...
See AnswerQ: The astronomer Carl Sagan once said, “We are made of
The astronomer Carl Sagan once said, “We are made of star stuff.” Explain why this is true of all life on Earth.
See AnswerQ: Some people think that many of our uniquely human traits arose by
Some people think that many of our uniquely human traits arose by sexual selection. Over thousands of years, women attracted to charming, witty men perhaps prompted the development of human intellect...
See AnswerQ: An abundance of ________ in Earth’s early atmosphere would have interfered with
An abundance of ________ in Earth’s early atmosphere would have interfered with assembly of organic compounds. a. carbon dioxide b. ammonia c. water d. oxygen
See AnswerQ: A massive die-off of lobsters in the Long Island Sound
A massive die-off of lobsters in the Long Island Sound was blamed on pesticides sprayed to control mosquitoes that carry West Nile virus. Why might a chemical designed to kill insects also harm lobste...
See AnswerQ: Horseshoe crab blood clots immediately upon exposure to bacterial toxins,
 Horseshoe crab blood clots immediately upon exposure to bacterial toxins, so it can be used to test injectable drugs for the presence of dangerous bacteria. To keep horseshoe crab populat...
See AnswerQ: True or false? Animal cells do not have walls.
True or false? Animal cells do not have walls.
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