What is the function of gel electrophoresis in genetic engineering?
A. carry DNA into a new cell
B. separate fragments of DNA by their length and electrical charges
C. cut DNA into many fragments
D. link together newly joined fragments of DNA
E. make millions of copies of a specific segment of DNA
Answer: B
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The main form of nitrogenous wastes released by aquatic invertebrates to their environment is ____
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
The unique attractive forces that keep molecules of water together are called:
a. strong forces. b. adhesion. c. hydrogen bonds. d. cohesion. e. weak nuclear forces.
The most common mode of pollination in angiosperms occurs by _____
a. birds b. wind c. water d. insects e. humans
It is summer, and you are excited about going to your local amusement park, and specifically about riding the new roller coaster that was just built. You imagine waiting at the top of the stairs for the roller coaster to pull into the station, climbing into the car, strapping yourself into the seatbelt, and pulling down the harness. You can imagine the cars slowly chugging up to the top of the first hill, coming down on the other side, and the excitement you expect to feel as you go along for the ride. Of all of the things that you have imagined, which is an example of potential energy?
A. waiting at the top of the stairs for the roller coaster to pull into the station B. the roller coaster car going up the first hill C. climbing into the car D. pulling down the harness