What is the main difference between acid-fast bacteria and non-acid-fast bacteria?
a) Acid-fast bacteria have a thick peptidoglycan layer, while non-acid-fast bacteria do not
b) Acid-fast bacteria retain the stain even after acid treatment, while non-acid-fast bacteria do not
c) Acid-fast bacteria are anaerobic, while non-acid-fast bacteria are aerobic
d) Acid-fast bacteria reproduce through binary fission, while non-acid-fast bacteria reproduce through conjugation