<prompt> All enzymes are not proteins. This statement is justified byAll enzymes do not follow the Michaelis Menton hypothesisRNAs act as ribozymesAntibodies take part in the catalysis of many reactionsMetals are involved in attachment to enzymes and catalysts  <response>: Ribozymes are RNA molecules with catalytic activities, which acts upon phosphodiester bonds in RNA cause its hydrolysis . RNAs are not protein but meet all the classic criteria of the enzyme, therefore, all enzymes are not protein. 