A small ca+2 binding protein that modifies the activity of many enzymes and other proteins in response to changes of ca2+ concentration, is known as: (A) Cycline, (B) Calmodulin, (C) Collagen, (D) Kinesin
Answer is B. Ans. (b) Calmodulin(Ref: Ganong, 25th ed/p.55)Once inside the cell, Calcium binds with calmodulin.This calcium - calmodulin complex activates an enzyme called calmodulin dependent protein kinases that phosphorylates many downstream effector proteins