Which step in this process requires use of restriction enzymes?
A) step A
B) step B
C) step C
D) step D
Answer: B
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Which U.S. government agency monitors water utility reports?
A) Environmental Protection Agency B) Food and Drug Administration C) Water Safety Board D) Natural Resources Conservancy Commission
Select all of the following that represent examples of taxis.
_____ In the Northern Hemisphere, Aquaspirillum bacteria burrow towards the magnetic north pole (the geographical south pole). _____ Cyanobacteria filaments in an intertidal environment migrate upward if salinity falls below 15% and downward if it rises above 15%. _____ Mammalian spermatozoa are guided toward an oocyte by a temperature gradient between the cooler sperm storage site and the fertilization site. _____ Human body lice change direction more frequently as the temperature of their immediate environment increases.
Which of the following best describes the endosymbiotic theory?
a. Aerobic respiration is more efficient than anaerobic respiration. b. Prokaryotes evolved to live side by side with eukaryotes. c. Eukaryotes are the result of one prokaryotic cell engulfing another. d. Mitochondria can only live inside a eukaryotic cell.
Biotic pollution has been particularly harmful to native species:a
in deserts. b. in tundra. c. on islands. d. in tropical rain forests. e. in grasslands