The distortion of enzyme molecules which occurs at high temperatures is known as denaturation.

Here's why:

* Enzymes are proteins: Enzymes are biological catalysts made of protein molecules.

* Proteins have specific shapes: The unique three-dimensional shape of an enzyme is crucial for its function. This shape allows the enzyme to bind to specific molecules (substrates) and facilitate chemical reactions.

* High temperatures disrupt shape: High temperatures cause the bonds that hold the protein molecule together to break. This disrupts the enzyme's three-dimensional structure, changing its shape.

* Denaturation means loss of function: When an enzyme loses its specific shape due to denaturation, it can no longer bind to its substrate effectively and loses its catalytic activity.

In summary: High temperatures denature enzymes by disrupting their structure, leading to a loss of function.