Monday, 9 January 2012

2.8a Enzymes

Understand the role of enzymes as biological catalysts in metabolic reaction.

As a catalyst, the enzyme is making a reaction faster but also under moderate conditions. Metabolic reactions refer to biological reactions taking place in the cell - building cells up and breaking molecules down.

To explain how enzymes work, here is the lock and key hypothesis:

The red structure represents in the enzyme and you will notice that it has a particular shape. It is a protein and within the molecule and there is a part of molecule (b) called the active site and this is the part of the enzyme molecule where the substrate (c) fits in and they are complimentary.When they fit together they form the structure (d) which is called a activated complex. The enzyme is able to weaken the structure of the substrate in this process.

The products (f) emerge from the enzymes but the enzymes remains unchanged by the reaction. The substrate is turned into product by the action of the enzyme. Since the enzyme is unchanged by the reaction it can react again with another substrate.

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  1. http://www.onlinemathlearning.com/gcse-biology.html

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