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Answered 2011-09-17 12:23:20

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Function of crystal violet?

Crystal violet is a staining reagent. The crystal violet stain forms a purple complex within the cell wall. In Gram's Method, the stain is used to differentiate bacteria into groups.


Does crystal violet stain gram negative or positive bacteria?

crystal violet is consider a simple stain so it gives the same color to all bacteria, a gram stains is what divides the bacteria into gram + or gram negatives


Function of crystal violet in gram stain?

Crystal violet stains G+ bacteria and G- bacteria at the beginning of the gram staining process. It is later washed away from the G- bacteria by the alcohol/acetone rinse.Shorter Answer:Stains G+ bacteria


What is crystal violet iodine complex?

In Gram staining procedure during bacterial staining , iodine forms a complex with crystal violet stain which stains Gram positive bacteria blue to violet .


Crystal violet in the MacConkey agar?

MacConkey's agar refers to a culture medium that is designed to selectively grow Gram-negative bacteria. It contains crystal violet dye, which inhibits certain Gram-positive bacteria.


Function of iodine in Gram stain?

It forms a complex with crystal violet stain which stains G Positive bacteria violet .


What is a decolorizer do in gram staining?

It removes the crystal violet (primary stain) from gram negative bacteria. It does not remove Crystal violet as easily from gram positive bacteria, because the highly peptidoglycan walls of gram positive bacteria interact with crystal violet and iodine to form a strong bond (CV-Iodine complex). So, gram positive cells hold on to the stain instead of letting it wash away.


What is a primary stain in microbiology?

crystal violet is the primary stain in microbiology because it is one of the dye of gram staining. crystal violet is used to dye the cell walls of bacteria in gram staining.


Purpose of crystal violet in macconkey agar medium?

It is a sugar and it is a nutrient for bacteria that are lactose fermentors


What type of bacteria is e coli?

E. Coli is a type of bacteria that is gram-negative. Gram-negative means that the bacteria do not retain Crystal violet dye.


What will be the color change of crystal violet at different pH?

Crystal violet is used in Gram's method of bacteria classification. At a pH of 1.0, the solution turns green, and when in a strongly acidic solution, it turns yellow.


What structure is stained in a counterstain?

Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. If the violet can be washed out and the counter stain (pink) is added, the bacteria are Gram-.


What would be the color of gram positive and negative bacteria when stained with crystal violet?

Well if you stained with only crystal violet, then they would all be violet! If you do a Gram Stain the right way, you end up getting Gram positive being violet or purple and Gram Negative being red or pink.


How is does gram stain work?

If a bacteria is gram-positive, it will stain a purple color by crystal violet. Gram-negative bacteria will stain pink by the Safranin.


Importance of crystal violet in gram staining?

important in distinguishing between gram positive and gram negative bacteria. Process: 1. Dye the bacteria with crystal violet 2. add iodine 3. wash with alcohol to decolourise 4. the gram positive should stay violet. the gram negative will become colourless. much love The SS x


What are the functions of crystal violet iodine ethanol and safranin red in gram staining?

Crystal violet is used first to stain all bacteria purple. However, when you immerse the bacteria then in alcohol, alcohol affects the permeability of the peptidoglycan layer to crystal violet, blocking its exit from gram-positive cells. This way, gram-positive cells remain purple while gram-negative cells are colourless. Safranin red is then used as a counterstain to make the two types of bacteria more differentiable.


Why would bacteria stain gram variable?

Gram variability of bacteria is a function of the cell wall composition. For gram positive bacteria (they stain in violet!) the cell wall is composed of peptidoglycan and they do not have a lipopolysaccharide layer above this peptidoglycan layer. Gram negative bacteria (stain pink!) have a lipopolysaccharide layer above the peotidoglycan layer which do stain violet with crystal violet, but are washed off by the ethanol treatment. The peptidoglycan layer beneath remains untouched by the crystal violet stain and is now free to take up the pink color of safranin.


What is the function of the iodine in the gram stain procedures?

Iodine serves as a mordant by binding to the crystal violet. An insoluble iodine-crystal violet complex is formed that allows gram positive bacteria to remain purple after this step in the gram staining procedure.


Enumerate the advantages derived from staining bacteria?

Staining bacteria is done by using a dye called crystal violet. This method helps in distinguishing different types of bacteria, as well as see the internal parts.


How can you remove crystal violet in a Gram Stain?

You can use acetone or alcohol to remove crystal violet(decolorizer).


What is pH range of crystal violet indicator?

crystal violet has a pH range of 7-8, which is basic.


Why some bacteria test gram positive and others gram negative?

Some bacteria test Gram positive because they have a thick cell wall made up of peptidoglycan that traps the crystal violet in the cytoplasm. Others test Gram negative because they have a thinner layer of peptidoglycan and crystal violet is easily rinsed from the cytoplasm.


Simple stain compared to differential stain?

Simple stain , is just used to bring the bacteria from the fore ground so you can see it better, and it's heat fix so it's no longer alive. Differential stain, is also heat fix, but you used Crystal violet which binds to the cell wall of the bacteria that have a thick cell wall, and Iodine is used as a mordant too help crystal violet attach to the cell wall, the counter stain is Safranin which then bind too bacteria that have less of a Cell wall, which makes them red/organ and the crystal violet make those bacteria purple. Hence you can differentiate between a Gram Negative which are the red/orange bacteria and the Gram Positive which are the Purple bacteria.


What is Beta-lactamase positive?

Beta-lactamases are enzymes produced by bacteria. Gram-positive bacteria can produce beta-lactamases. This type of bacteria takes up the crystal violet stain in gram staining.


Why do crystal violet and bile salts in MacConkey agar inhibit the growth of gram-positive bacteria?

This is a fairly difficult question to answer. Most readings will only tell you that bile salts and crystal violet inhibit gram-positive growth but do not say why. I found some articles that probably would tell us why, but you must pay to subscribe to them. I do know why crystal violet inhibits gram-positive growth though. Crystal violet binds to the peptidoglycan layer of cell membrane in gram-positive bacteria (just like it does in the Gram stain). Gram-negative bacteria have an outer membrane that prevents the crystal violet from attaching to their peptidoglycan layer. Once crystal violet attaches to the peptidoglycan, enzymes called autolysins are unable to cut the polysaccharide linkages between the NAG and NAM residues. The cutting and reforming of the peptidoglycan layer is necessary for cell growth, thus killing the cell. I believe that bile salts work a very similar way just like how penicillin and lysozymes do.