<prompt> Which of the following enzyme is not regulated by calcium or calmodulin?Adenylate cyclaseGlycogen synthaseGuanylyl cyclaseHexokinase  <response>: Calmodulin mediated action of Ca2 : Calmodulin mol. wt. 17,000 is a calcium binding regulatory protein. Ca-calmodulin complex activates certain enzymes e.g. adenylate cyclase, Ca2 dependent protein kinases.Ref: Satyanrayana, Ed 3, page no 405 