Fumarase enzyme belongs to which class?

The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme green-gram-phosphatase. What does the graph indicate?

In most plant cells,most enzymes have their optimum activity at: (in $^\circ C$)

The activity of an enzyme is sensitive to the presence of specific chemicals,which is called:

Discuss the factors affecting enzyme activities.

Enzymes are destroyed at: