Enzymes are sensitive to

At a temperature just below the freezing point,the enzyme:

Match the following Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(A)$ Transferases	$(i)$ $H_4P_2O_7$ related reactions
$(B)$ Lyases	$(ii)$ Hexokinase
$(C)$ Isomerases	$(iii)$ Cytochrome oxidase
$(D)$ Ligases	$(iv)$ Aldolase
$(E)$ Oxidoreductases	$(v)$ Glucose-$6$-phosphate $\rightarrow$ Fructose-$6$-phosphate

The given graphical representation relates to enzyme activity under three conditions ($pH$,temperature,and substrate concentration). What do the given axes $X$ and $Y$ represent?
$X$-axis $-$ $Y$-axis

The enzyme phosphoglucomutase belongs to which of the following classes?

What are the different classes of enzymes? Explain any two with the type of reactions they catalyse.