How can cAMP be a messanger in many cells?
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Ответ:
Second messengers are small molecules and ions that relay signals received by cell-surface receptors to effector proteins. They include a wide variety of chemical species and have diverse properties that allow them to signal within membranes, within the cytosol , or between the two . Second messengers are typically present at low concentrations in resting cells and can be rapidly produced or released when cells are stimulated. The levels of second messengers are exquisitely controlled temporally and spatially, and, during signaling, enzymatic reactions or opening of ion channels ensure that they are highly amplified. These messengers then diffuse rapidly from the source and bind to target proteins to alter their properties to propagate signaling.
Ответ:
A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal.