Some individual hormones have so many different effects because
1.they influence gene transcription.
2.they trigger a second messenger system that produces a cascade of effects.
3.there are a great many different cells in different tissues that have specific receptors for the hormone.
4.the hormone is carried throughout the body and only a small amount is needed to produce its effect.
5.all of the choices
3
You might also like to view...
A microbial environment containing high nutrient concentrations is called an oligotrophic environment.
Answer the following statement true (T) or false (F)
The "charging" or activation of a tRNA molecule includes:
A. the covalent attachment of an amino acid to the 3'-terminal cytosine of the tRNA. B. the covalent attachment of the amino group of an amino acid to the tRNA. C. the covalent attachment of the carboxyl group of an amino acid to the tRNA. D. the covalent attachment of an amino acid to the 5'-terminal adenosine of the tRNA.
The classification of prokaryotes in Bergey's Manual of Systematic Bacteriology is largely based on
A) Gram stain reaction. B) habitat. C) type of electron receptor used in cellular respiration. D) rRNA sequences. E) cellular morphology.
Adult T-cell leukemia is thought to be caused by ________.
A. herpesviruses B. picornaviruses C. retroviruses D. parvoviruses