Select the color of the gram-positive cells and the gram-negative cells AFTER each step of the Gram stain process. Use the drop-down menus to make your selection. Clear Purple Pink STEPS | Gram-Positive Cells | Gram-Negative Cells Before staining | (Click to select) | (Click to select) Crystal violet | (Click to select) | (Click to select) Gram's iodine | (Click to select) | (Click to select) Alcohol decolorizer | (Click to select) | (Click to select) Safranin | (Click to select) | (Click to select)
Added by Adrienne H.
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Step 1: Before staining - Gram-Positive Cells: Clear - Gram-Negative Cells: Clear Show more…
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In the image below bacteria that have been run through the steps of the gram stain are shown as numerically labeled cells. From the drop down selections, select what color each cell type of cell (gram positive or gram negative) would be following each step of the gram stain: Step 1 Crystal violet Step 2 Iodine Step 3 Alcohol wash Step 4 Safranin Gram-positive bacterial cell Gram-negative bacterial cell Choose the color of the cell: Cell #1: [ Select ] Cell #2: [ Select ] Cell #3: [ Select ]
Supreeta N.
In Gram Stain, crystal violet functions as the primary stain. Once this is added, Gram positive cells look purple while Gram negative cells are colorless. Next, the mordant iodine is added and all the cells look the same as in the previous step. The next step is the addition of ethanol, which functions as the decolorizer. It is at this point that Gram positive cells look purple while Gram negative cells look colorless. Addition of the secondary dye safranin will make Gram positive cells look purple and Gram negative cells look pink. However, if ethanol is added for too long, Gram negative cells look purple while Gram positive cells look pink.
Marlyn J.
When performing a Gram stain on a mixture of bacteria Select one: a. Gram positive cells only stain in the presence of Gram negative cells because of lateral gene transfer b. Gram positive cells stain red because they have a thin peptidoglycan layer and retain crystal violet c. Gram positive cells stain purple because they have a thick peptidoglycan layer and retain crystal violet d. Gram positive cells stain red because they have a thick peptidoglycan layer and retain crystal violet e. Gram positive cells stain purple because they have a thin peptidoglycan layer and retain crystal violet
Md.Daniyal A.
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