Enzymes and substrate fit together at the active site to form a lock and key mechansim. This means

a) if they don't fit, it is the wrong substrate or the enzyme is denatured.

b) substrates work on enzymes, allowing them be be denatured.

c) the shape and size of the enzymes does not matter.

d) enzymes are not specific and work on a variety of substrates.

The lock and key mechanism of enzyme and substrate means that if they don't fit, it is the wrong substrate or the enzyme is denatured.

WHAT IS AN ENZYME?

An enzyme is a protein substance that regulates biochemical activities in living cells by acting as a catalyst.

Enzymes act on substrates but they do not get changed during the process. This means that enzymes can be used over and over again.

Enzymes are substrate-specific i.e. they act on specific substrates. The lock and key model explains the mechanism of action of enzymes. Enzymes attach to substrate at their active sites and act on them to form products.

The lock and key model explains that if enzyme and substrate don't fit, it is either the wrong substrate or the enzyme is denatured.

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