Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis,leaving double bonds,are known as:

$S$ - Statement: Ligases are enzymes that catalyze the linking of two compounds together.
$R$ - Reason: Isomerases are enzymes that catalyze the inter-conversion of optical,geometric,or positional isomers.

Which of the following statements is correct regarding enzymes?

The transition state structure of the substrate formed during an enzymatic reaction is:

Enzymes,which catalyse the joining of $C-O, C-S, C-N, P-O$ etc. bonds,are included in which of the following classes?

"Enzymes are proteins", it was suggested by