Who demonstrated that alcoholic fermentation was an enzymatic process?

Name the class of enzyme that usually catalyzes the following reaction:
$S-G + S^* \rightarrow S + S^*-G$
Where,
$G \rightarrow$ a group other than hydrogen
$S \rightarrow$ a substrate
$S^* \rightarrow$ another substrate

Activation energy $ = .......... $

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

Which of the following enzymes catalyzes the joining of $C-S$ bonds?

"Enzymes are proteins", it was suggested by