Enzymes are biocatalysts. They catalyse biochemical reactions. In general they reduce activation energy of reactions. Many physico-chemical processes are enzyme mediated. Which of the following reactions is not engyme-mediated in biological system?
Helicase helps in unwinding of DNA helix.
Sucrose is hydrolysed into glucose and fructose with the help of enzyme sucrase.
Peptidyl transferase is involved in peptide bond formation.