Sutherland found evidence for the presence of a g protein- coupled receptor for epinephrine in muscle cells. for this receptor to function normally, it must have at least how many binding sites, and what must be bound?

Three binding site

- guanine nucleotide

- guanosine triphosphate

- guanosine diphosphate

Explanation:

These sites are essential in signal transfer, cell growth, cytoskeletal assembly, protein synthesis and membrane vesicles transport.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.