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LOCK AND KEY
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| Words: 295 | Submitted: 04-Sep-2012
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DescriptionLock and Key Model
Lock and Key Model
When you go home at night and the door is locked, can it open itself? Nope.
You need a key that is just the right shape to fit in that lock.
Otherwise, you're stuck in the cold. Enzymes work in a similar way (locks and keys).
Enzymes complete very specific jobs and do nothing else.
They are very specific locks and the compounds they work with are the special keys.
In the same way there are door keys, car keys,
And bike-lock keys, there are enzymes for neural cells, intestinal cells, and your saliva.
Here's the deal: there are four steps in the process of an enzyme working.
1. An enzyme and a substrate are in the same area. The substrate is the biological molecule that the enzyme will attack.
2. The enzyme grabs onto the substrate with a special area called the active site
Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme)
The active site is a specially shaped area of the enzyme that fits around the substrate.
The active site is the keyhole of the lock.
3. A process called catalysis happens. Catalysis is when the substrate is changed.
It could be broken down or combined with another molecule to make something new.
4. The enzyme lets go. Big idea.
When the enzyme lets go, it returns to normal, ready to do another reaction.
The substrate is no longer the same. The substrate is now called the product.
Substrate- The material or substance on which an enzyme acts.
Active site The part of an enzyme at which catalysis of the substrate occurs.
Product- The enzyme is able to convert a substrate to a product but the enzyme does not get consumed in the reaction.
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