Question

All enzymes are not proteins. Which of the following enzymes is not a protein?

• A. $DNA/RNA$ polymerase
  
• B. Both correct
  
• C. Ribonuclease discovered by Altman $\left(1983\right)$
  
• D. Ribozyme discovered by Cech $\left(1981\right)$
  

Answer 1

The correct option is A $DNA/RNA$ polymerase


Enzymes

• Enzymes are molecules that catalyse the various biochemical reactions in the body without themselves undergoing any change.
• They are also called biocatalysts.
• Most enzymes are proteins. Examples include pepsin.

Ribozymes

• Ribozymes are also called catalytic RNA. It is a RNA (nucleic acid) enzyme found in the ribosomes.
• They play a role in viral replication, RNA splicing and catalyse the joining of amino acids to form protein chains.
• Thomas R. Cech and Sidney Altman were awarded the Nobel Prize in 1989, for discovery of catalytic properties of RNA.

Ribonuclease

• Ribonuclease is a type of ribozyme discovered by Thomas R. Cech and Sidney Altman who were awarded the Nobel Prize in 1989 for the same.
• Ribonuclease catalyses the cleavage of a RNA sequence on a tRNA molecule.

Final answer
$\left(3\right)$ Both correct