Which of the following receptors does not trigger depolarization of a sensory neuron?
A. mechanoreceptors
B. G-protein receptors
C. chemoreceptors
D. photoreceptors
E. exteroceptors and interoceptors
D. photoreceptors
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Intermediate filaments
A) can be composed of the protein vimentin. B) are solely responsible for animal cell shape. C) are composed of ?-and ?-tubulin. D) are 70 nm in diameter. E) both choices A and D
Assume that a bacterial cell produces a Lac repressor that is able to bind to the operator sequence of the lac operon but
cannot bind allolactose. Explain the effect on transcription of the lac operon is the presence and absence of lactose.
What will be an ideal response?The demographic transition is typically seen
a. when a country moves from an industrial phase into a more agricultural phase. b. as developed countries use more resources. c. when agriculture becomes more efficient. d. when epidemics lead to high death rates. e. as a country moves toward a more industrial phase.
Damage to its flagellum would prevent a choanocyte from
A. secreting spongin to form the sponge body. B. circulating water through the sponge. C. producing the supportive spicules. D. stinging and capturing prey.