BIO-240 Lab-Exercise3 Spr18 0Cen - Word Table Tools Layout References Mailings R

Question

BIO-240 Lab-Exercise3 Spr18 0Cen - Word Table Tools Layout References Mailings Review View Foxit PDF Design LayoutTell me what you war Paragraph Styles 1. identify different colonies on body and environment parts. Fill the following table for two colonies from each section Colony Size Color Opacity Texture FormElevation Margin Body 1. Scratia 1 um ed Gram ()lssy circular convexentire 2. Micfacoccus2u yellow Gram()glossy CircularConvexentire 1 um White Gram(+) Glossy, Circular Convex entire smooth Env. 3. Staphylococcus 4 opaque 1 um Opaque Gram () Glossy, Circular Convex entire smooth 2. Distinguish between colonial morphology and cellular morphology. How can observations about these morphologies facilitate identification of a specific organism? 3. What is the function of heat fixing before staining? 4. What properties of the stain and the bacterial cell cause the stain to adhere to the cells?

Explanation / Answer

4. Ans-

Bacterial cells are negatively charge that require a positively charged stain to stain their cell surface. Basic dyes have a positively charge chromophore that helps in adhering to negatively charge bacterial cell surface and causes the color of the surface of the cells.Acidic dyes are negatively stain, when it apply then repelled from the surface of the cell because bacterial cells are negative that causes the cell colorless.

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