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

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

When an enzyme-induced product inhibits enzymatic activity,the inhibition is called:

What is the substance upon which an enzyme acts called?

The enzyme diastase was identified by

Given below are the statements regarding enzymes. Choose the correct statements.
$i$. All enzymes are proteinaceous.
$ii$. Enzyme becomes more active at the temperature of $60^{\circ}C$ to $70^{\circ}C$.
$iii$. Enzymes have one or two active sites where substrate binds with the enzyme.
$iv$. Any increase or decrease in specific $pH$,enzyme activity is always enhanced.
$v$. Enzymes remain active to catalyze again after completion of first reaction.