Question

Which model of enzyme action is represented in the given image?

• A. Lock and key
• B. Induced fit
• C. Michaelis-Menton
• D. None of the above

Answer 1

The correct option is B Induced fit

In the image given here the substrates do not fit into the enzyme active site like a lock and key, instead the substrates induces a change in the enzyme active site on binding the enzyme, thereby enabling the interaction between the substrates and formation of products. Therefore the representation shown here is the induced fit model of enzyme action.
In the lock and key model the substrate structure has to be the right fit for the enzyme active site, like that of a key and its lock. Similar to how a key has to be the correct one for a lock, no reaction takes place if an incorrect substrate tries to bind the enzyme.