(b)+Enzyme+models

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 * 1) ====The yellow compounds are called the **substrate**. The substrates have the exact same shape as the shape of **active site** which is a hole for the substrate to fit in, and they are part of **enzyme** (blue).====
 * 2) ====The substrate fit into the active site and get connected with the enzyme. In this stage, the **enzyme-substrate complex** is formed.====
 * 3) ====The substrate becomes two different substrates because there is a weak chemical bond between them and it forms **enzyme-products complex**.====
 * 4) ====Since the substrate has weak bond between them, they get separated and become the **products** by leaving from the enzyme.====

**Lock-and-key model:**
====There are enzyme (made of protein) and a compound called the substrate. In lock-and-key model, the shape of the substrate has to be same as the shape of active site which is a key hole for the substrate to fit in, and it is part of enzyme. By substrate fitting into the active site, an enzyme-substrate complex is formed. After the enzyme-substrate complex is formed, the substrates become two different substrates to become products due to the weakening of its chemical bond between the two substrates, and this stage is called an enzyme-products complex. Since the bond between them is weak, it is easy to break down. So after the enzyme-products complex is formed, the substrates leave the active site as the products. If the substrate is either big, small or incorrect shaped, they do not fit into the active site, so the lock-and-key process would not happen.====

Lock = enzyme Key = substrate Active site = the key holes that substrate fit into

What is the induced Fit Model of an Enzyme?
The induced fit model of an an enzyme starts by two substrates approaching the enzyme, and the enzyme then binds the two substrates together in the Active Site. The binding of the two substrates causes the enzyme to change shape. An example of this is if the two elements sucreted by the enzyme are fructose and glucose then the product will be sucrose.

What is the differance between the Induced Fit Model and the Key and Lock Model?
Induced Fit Model - combines two substrates Lock and Key Model - seperates two substates

Below you can see two videos which clearly show the differance...
 * Induced Fit Model || Lock and Key ||
 * media type="youtube" key="z8lG8X9ZvxQ" height="221" width="296" || media type="youtube" key="TLr7_2wnIXU" height="221" width="411" ||