Homework Answers
After G protein couple receptor, the second most cell surface receptors is enzyme couple (linked) receptor pathway. In this pathway G protein or Cytosolic domain linked G protein is not present in the cell surface. In this pathway, Cytosolic domain has intrinsic or direct enzyme activity (like kinase enzyme). The main function of Secondary messenger is received single from cell surface receptor and transfer in other target. This messenger is active in G protein pathway and also enzyme couple pathway. SH domain is helped in pathway activation of enzyme couple receptor. So, here G protein is correct answer.
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