Pili may do four of the following. Which is the exception?
A. They help cells attach to surfaces.
B. They function in conjugation.
C. They extend from the cell surface.
D. They can be transferred between cells.
E. They function in cell locomotion.
Answer: D
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The ability of rats to cope with stress as adults can be affected by ____
a. a nurturing mother b. the number of siblings they have c. the temperature they are raised in d. the altitude they are born at e. their sex
Which of the following is a fire-maintained climax that gives way to oak woodland when fire is suppressed?
A) arctic tundra B) chaparral in California C) sugar maple-basswood forest in Wisconsin D) oak-hickory forest in the Piedmont of North Carolina
A tomato plant is mutated with gamma radiation. A cellular analysis reveals that ATP synthase complexes found in the thylakoid membrane are inserted backwards into the membrane. What is the most likely outcome of this error?
A. The ATP synthase will pump protons into the stroma in this orientation. B. The proton gradient in the thylakoid space will not be able to be used to generate ATP. C. The thylakoid membrane will become permeable to protons as a result of this change. D. A proton gradient will not be established in the thylakoid space in response to the activation of photosystem II. E. This change is not likely to have any effect on the function of the ATP synthase enzyme with respect to its role in photosynthesis.
Non-nitrogen-fixing bacteria bring in ammonia and use it for anabolic pathways by incorporating it into
a. glutamate. b. glutamine. c. oxaloacetate. d. both glutamate and glutamine.