This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following enzyme is not a protein ? 
Select and explain. 
A. Carboxypeptidase, B. Amylase, C. Ribozyme, D. DNAase
C: Ribozyme
Answer: C: Ribozyme 
Explanation: 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.