In Anolis lizards, the male sex hormone ____ induces ____ behavior in males, which in turn stimulates females to produce hormones that cause ____
Fill in the blank with the appropriate word.
testosterone, courting, full development of the ovaries
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Which of the following is(are) shared by both prokaryotic and eukaryotic cells?
a. cell wall b. nucleus c. cytoplasm d. organ systems
Transgenic bacteria are bacteria:
a. that only have trans-DNA. b. that have hybridized with other species of bacteria. c. found in the DNA of other organisms. d. that have a sequence of DNA from another organism inserted into them. e. that produce genes used in recombinant DNA technology.
You and your friend are on vacation at Yellowstone Park. The plaque in front of a sulfur hot spring reads: "This sulfur spring is 80°C, has a pH of 2, and contains large amounts of sulfur which is oxidized by Sulfolobus species of archaea." Your friend is excited. "Boy, if those microbes are that tough they should be easy to grow in the lab. I think I'll work with those for my summer project." What do you think?
A. The sulfur spring is pretty extreme, but after a few days the individual archaea should have adapted to lab culture conditions. B. The sulfur spring is pretty extreme, but after a few generations the species should have adapted to the lab culture conditions. C. You agree, and decide to partner with your friend to work on this organism as well. D. A species adapted to such extreme conditions would probably not be easy to culture in the very different conditions of a lab.
Which of the following is not a characteristic of a prokaryote?
A. Its DNA is not encased in a membrane. B. It has a cell wall made of peptidoglycans or other distinct chemicals. C. It does not have membrane-bound organelles. D. Its DNA is wrapped around histones. E. All of these are characteristics of prokaryotes.