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Acid fast organism would be gram positive.
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The above answer is incorrect. Acid-fast bacteria would be "gram negative."
Bacteria such as these have very different cell walls which contain a great deal of waxy material, although they still contain peptidoglycan. This waxy material prevents stain penetration, rendering the cell invisible.
Since these acid-fast bacteria are not stained by Gram's Stain Method they have been characterized as "gram negative."
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Heres what the text book says. This is a tricky question based on opinion.
"Their cell walls are unique among the gram-positive bacteria because they consist of other layers in addition to peptidoglycan. An important component of their walls is a group of fatty acids called mycolic acids. Some have proposed that the mycolic acids form a bilayer structure that is analogous to the outer membrane of gram-negative bacteria."
So answer one is technically correct but they characteristics as those of gram negative cells (answer 2).
Page 58
Prescott's Microbiology
Edition: 8th
Author(s):
Willey; Sherwood; Woolverton
ISBN13:
9780073375267ISBN10:
0073375268
Format:
Hardcover
Pub. Date:
1/1/2010
Publisher(s):
MCGRAW HILL
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