Final answer:
Laemmli stock solution is used to prepare PAGE samples for protein separation in gel electrophoresis. It denatures proteins and allows them to migrate based on size.
Step-by-step explanation:
PAGE samples are prepared using Laemmli stock solution, which is a mixture used to denature and separate proteins during gel electrophoresis. The Laemmli stock solution contains sodium dodecyl sulfate (SDS) and other components that help denature the proteins and coat them with a negative charge. This allows the proteins to migrate through the polyacrylamide gel based on their size only.