What is calmodulin, and what role does it play in signal transduction? What will be an ideal ...

Answer to q. 1

Calmodium is an important Ca+2 binding protein. When calcium gates open in the plasma membrane
or the cytoplasm, the Ca+2 concentration rises in the cytosol. When calcium ions bind to a calmodium
molecule, the molecule changes shape and activates certain enzymes including protein kinases and
phosphatases

Answer to q. 2

The first messenger binds the inital receptor. Second messengers relay signals inside the cell and
thereby amplify the signal from the first messenger. An example of a first messenger is prostaglandin
with its second messenger being cAMP