Think on two complex tinkertoy models that exactly fit one way only. Compare that to the substrate (one tinkertoy model) and the enzyme (the other model).

In fact, the lock and key model fits several chemical, biological, and cellular reactions.

(Broken Link Removed)

http://en.wikipedia.org/wiki/Enzyme

Can someone plz help me with this.

I don't know how to explain the lock-and-key model of enzyme function.

Since info can be added, edited by anyone in Wikipedia, I am not sure whether to trust that the info in wikipedia is correct. What do you think Dr. Pursley??

I personally have had very little problem with Wiki. Independent studies have confirmed the error rate is less than Britticana.
In controversial areas frought with opinion, Wiki is about as good as other references...everyone having an ax to grind.

I generally trust Wiki, but do look at other sources. Wiki is quick, easy, and generally reliable.
You made a good point.