Final answer:
To enhance visibility of onion cell organelles, stain the cells with iodine solution.
Explanation:
A laboratory procedure that would be used to make the organelles of onion cells on a wet mount slide more visible for viewing with a compound light microscope is to stain the cells with iodine solution. Staining increases contrast and allows for better visualization of the cell structures.
Learn more about microscope slides and cell visibility here:
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