The process of converting nitrogen gas to ammonium is called
A) biogeochemical processing.
B) sublimation.
C) nitrogen fixation.
D) evaporation.
E) nitrification.
C
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Which of the following is nottrue of the lacI region of the lac operon?
A. It is transcribed separately from the operon. B. It produces a diffusible product that can regulate the expression of the operon. C. It is bound by the Lac repressor when lactose is unavailable. D. Its mutation leads to constitutive expression of the operon.
Eukaryotic chromatin can be described in topological terms as a series of:
A. constrained segments. B. constrained loops. C. relaxed linear segments. D. relaxed loops. E. plectonemic supercoils.
Predators that prevent the population of their prey from exploding and thus outcompeting their prey are called:
a. regulators. b. herbivores. c. keystone species. d. omnivores. e. decomposers.
A stem cell is a cell that
a. can differentiate into specialized cell types. b. has already differentiated. c. can develop into two or three cell types. d. can only develop into skin cells. e. can only develop into bone cells