Explain how enzymes accomplish biological catalysis

what are enzymes:
enzymes are the biological catalysts that speed the biological reactions inside the body,,
what enzyme actually do:
enzyme lower the activation energy needed to start the reaction so reaction stars in a small time,,
also as enzymes are proteins so they they amino acids having R group,, that is also responsible fr making the reaction fast..

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !