Final answer:
Mycolic acid is the waxy material that makes bacteria acid-fast, primarily found in the outer membrane of acid-fast bacteria like Mycobacterium.
Explanation:
Mycolic acid is the waxy material that makes a bacterium acid-fast. It is primarily found in the outer membrane of acid-fast bacteria, such as those belonging to the genus Mycobacterium. Mycolic acid acts as a protective barrier and prevents stains from penetrating the cell walls of these bacteria.
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