Answer:
Cells that respond to peptide hormones usually do so through a sequence of biochemical reactions involving receptor and kinase activation. In order for cells to respond, it is necessary for first and second messengers to communicate. This is possible because <u>C) G protein acts as the link between first and second messengers </u>.
Explanation:
When the first messengers join the receptor, in the external membrane of the cell, it produces a change in the shape of the receptor that causes the join of the G protein to this structure. The G protein joined to the receptor and the first messenger modulates the activity of the second messengers inside the cell.
<span>Interactions between organisms and the number of species in an ecosystem add to the resiliency of an ecosystem. :)</span>
Caverns are formed due to <span>Carbonic Acid which is found in ground water and which also dissolves limestone.</span>
It is quite possible to combine the same two elements to form two different compounds. An example would be carbon dioxide CO2 and carbon monoxide CO. Thus, two elements can form different types of bonds and end up with completely different compounds. Like, Hydrocarbons are compounds made of Hydrogen and Carbon only, and there are many different hydrocarbons. There is a limited number of elements, but a larger number of compounds because of the example demonstrated above.