Explain why the 3-dimensional structure or shape of an enzyme is the key to its activity. include active site and induced fit in your discussion. (1)

In each enzyme, the active site is induced to fit specific substrate molecules. Thus, the specificity of its 3-dimensional structure plays a key role in its activity, as specific substrates fit to the specific enzyme. Its induced fit, however, as explored by the Induced Fit Model changes shape slightly in order to cater for the slight shape changes of a substrate.

Where's the picture of the model?