TLS Online TPP Program

#Question id: 40415


Which of the following errors during the Gram staining procedure would most likely cause a Gram-positive bacterium to appear Gram-negative (pink)?

#Applied Microbiology
  1.  Forgetting to add Iodine.
  2. Using an old culture (older than 24-48 hours)
  3. Over-decolorizing with alcohol. 
  4. All of the above