Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 1

Chemical Signals and Second Messengers. Fill in the blanks with the appropriate terms.
(a)____ is an intracellular protein that binds calcium and activates enzymes.
(b)Glucagon is an example of an _____ hormone.
(c)A substance that fits into a specific binding site on the surface of a protein molecule is called a _____.
(d)Two products of phospholipase C activity that serve as second messengers are _____ and _____.
(e)Cyclic AMP is produced by the enzyme ______ and degraded by the enzyme _____.
(f)Calcium ions are released within cells mainly from the ______.