At what rate is the product formed for the reaction given below?
$H_2O + CO_2 \rightleftarrows H_2CO_3$

Which of the following equations correctly represents the mechanism of enzyme action?

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.

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

To explain the mechanism of enzymatic action, who proposed the "Lock and Key hypothesis"?

The graph showing the concept of activation energy of an enzyme is given below. Observe the graph and choose the correct option for $M$ and $N$.