<prompt> Which of the following enzyme is not a protein ?CarboxypeptidaseAmylaseRibozymeDNAase  <response>: Ans. is c i.e.,Ribozyme Enzymes are natural thermolabile, biological catalysts. They are protein or polypeptide in nature, except for a few, i.e., ribozyme is not a protein but a RNA molecule with catalytic activity. enzymes are secreted by living cells. 