Question

what is the purpose of installing the comb?
○ to remove all bubbles from the gel
○ to create a well or pockets in the gel where samples can later be placed
○ to ensure that the gel is perfectly level

Explanation:

In gel electrophoresis (a common biology technique), a comb is inserted into liquid gel before it solidifies. When removed, it leaves wells/pockets where samples (e.g., DNA) are placed for separation. Removing bubbles and leveling the gel are done via other steps, not the comb.

Answer:

To create a well or pockets in the gel where samples can later be placed