In chemical synapses that involve a so-called second messenger, typically a G-protein linked to the postsynaptic receptor is activated when neurotransmitter binds to that receptor. Which of the following represents an activity performed by the activated second messenger?

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#Question id: 4368

#Unit 3. Fundamental Processes

Which statement is false concerning the general transcription factor, TFIID?

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#Question id: 11292

#Unit 10. Ecological Principles

In an pond ecosystem the _____ is always greater than the _____ .

(a) number of primary producers . . . number of secondary consumers

(b) biomass of secondary consumers . . . biomass of primary consumer

(c) assimilation efficiency of primary consumers . . . assimilation efficiency of secondary consumers

(d) biomass of primary producers . . . biomass of primary consumers

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#Question id: 3285

#Unit 11. Evolution and Behavior

Natural selection continually operates on each species to keep up with improvements made by competing species; each species’ environment deteriorates as its competitors evolve new adaptations. This is known as

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#Question id: 19336

#Unit 12. Applied Biology

Which one of the following biosensors is used for therapeutic applications?

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#Question id: 4935

#Unit 11. Evolution and Behavior

Which gas was least abundant in Earthʹs early atmosphere, prior to 2 billion years ago?