In attenuation regulation of the trp operon, which stem loop forms when tryptophan is readily available to the cell?
A. 1:3
B. 2:3
C. 3:4
D. 2:4
Answer: C
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A small group of mice were released on an island. The island previously had no mice on it, but had abundant food and no predators. After several years of growth, the size of the new island population stabilizes. However, at this point a hurricane drastically reduces the population. How would you describe the situation?
A. The biotic potential of the population has been reduced. B. The new population size is a result of density-dependent regulation. C. The new population size is a result of density-independent regulation. D. The island mouse population can now act as a sink metapopulation. E. The island mouse population can now act as a source metapopulation. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about natural event affecting a population? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Four of the five answers listed below are actions mediated by the sympathetic nervous system. Select
the exception. a. pulse increases b. blood glucose levels drop c. metabolism increases d. digestion slows down e. pupils of the eye dilate
Who am I? I am a lipid-derived hormone produced in response to the presence of insect pests
a. cytokinin b. abscisic acid c. jasmonic acid d. gibberellin e. auxin
Which of the following is not true of the fossil record of life on Earth?
A. Vertebrates such as reptiles or mammals are less likely to leave a fossil record than annelids and flatworms. B. Animal species do not appear in the fossil record for billions of years after the emergence of microorganisms.