In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because
A. each hormone can bind to multiple receptors simultaneously causing amplification of the signal.
B. the signal is amplified by activation of transcription factors that each catalyze multiple reactions.
C. the hormone triggers the cell to release more hormones, amplifying the signal.
D. the signal is amplified by activation of enzymes that each catalyze multiple reactions.
E. each hormone can bind to transcription factors simultaneously causing amplification of the signal.
Answer: D
You might also like to view...
Biosensors involve linking which of the following with electronic circuitry?
A. Microorganisms B. Microbially derived enzymes C. Gene chips D. Both microorganisms and gene chips are used with electronic circuitry. E. Both microorganisms and microbially derived enzymes are used with electronic circuitry. F. Both gene chips and microbially derived enzymes are used with electronic circuitry.
In a pedigree, an affected male would be designated by
A. a shaded circle. B. an open square. C. a square with a line through it. D. an open circle. E. a shaded square.
Researchers can deliver genes into plants by using
a. the bacterium Agrobacterium tumefaciens. b. microscopic particles coated with DNA. c. electric shocks. d. chemicals. e. all of these.
Hagfish (Eptatretus cirrhauts) are a jawless marine vertebrate that are isotonic with their environment and are considered to be osmoconformers. How might this interesting adaptation limit the habitat that the hagfish can tolerate?
A) Hagfish are not limited by salinity. B) Osmoconformers do not face the same pressures as osmoregulators and can live in any marine environment. C) Individual hagfish will adapt to different salinities over their lifetime and, therefore, can inhabit any marine environment. D) Hagfish habitat is limited by the salinity of the environment.