In the Gram stain, gram-negative bacteria appear red for all the foll

Aquaculture Science
3rd Edition
ISBN:9781133558347
Author:Parker
Publisher:Parker
Chapter2: Aquatic Plants And Animals
Section: Chapter Questions
Problem 2KA
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In the Gram stain, gram-negative bacteria appear red for all the following reasons EXCEPT:
They stain with safranin because they are colorless at the step where it is added
Safranin is a red stain
None of the other four answers (all are true)
The peptidoglycan layer in their cell walls is too thin to retain the crystal violet-iodine
complex when the decolorizer (alcohol) is added
The gram-negative cells' outer lipopolysaccharide layer (outer membrane) prevents their
being stained by crystal violet in the first step
Transcribed Image Text:In the Gram stain, gram-negative bacteria appear red for all the following reasons EXCEPT: They stain with safranin because they are colorless at the step where it is added Safranin is a red stain None of the other four answers (all are true) The peptidoglycan layer in their cell walls is too thin to retain the crystal violet-iodine complex when the decolorizer (alcohol) is added The gram-negative cells' outer lipopolysaccharide layer (outer membrane) prevents their being stained by crystal violet in the first step
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