The polymerase chain reaction has revolutionized genetics because
A) it is capable of making virtually unlimited copies of DNA for study.
B) it is capable of making copies of DNA with very little starting material.
C) it is capable of making large numbers of DNA copies very quickly.
D) All of these
E) A and B only
D
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Why have tomatoes been genetically modified?
A) to improve absorption of vitamins in the human body B) to grow rapidly before temperatures fall below freezing C) to kill insect pests on contact D) to have a longer shelf life in grocery stores
An animal with a simple netlike nervous system is the
A. octopus. B. hydra. C. planarian. D. cat. E. earthworm.
Which of the following would NOT be a way that influenza is transmitted?
A) direct contact B) indirect contact C) droplets D) foodborne transmission
Martin keeps a worm bin in his basement because they need cooler temperatures to survive. He feeds them about 1 pound of kitchen scraps each week. One summer the temperatures rose above the optimal temperature for the red worms (~ 85°F) and many in his colony died. However, those that survive continued to reproduce and within 6 months his colony was again thriving. The next summer, unusually warm temperatures again cause the basement temperatures to rise above 85°F for 2 days in a row. Surprisingly, Martin noticed that only a small portion of the worm colony died. What is the best explanation for this?
What will be an ideal response?