Essay by PaperNerd ContributorCollege, Undergraduate April 2001

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LAB: IDENTIFYING BACTERIA PURPOSE: To know the basic types of bacteria To know how different types of bacteria are identified To know the role(s) bacteria are identified BACKGROUND INFORMATION: Bacteria are divided into different groups based on a number of characteristics. One is to distinguish the bacteria's shape. Bacteria that resemble spheres are called coccyx. Bacilli are bacteria that look like rods. Bacteria that resemble spirals are called spirilla. Another way to distinguish bacteria is by their ability to accept a specific type of strain called gram-stain. Bacteria that loose the dark stain and show only the purple stain and a light pink stain. Bacteria that loose the dark stain and show only the light pink stains are called gram-negative. Bacteria that retain the dark purple stain are called gram-positive. The movement or mobility of bacteria is referred to as Brownian movement. Flagellated bacteria exhibit true movement of bacteria.

HYPOTHESIS: I believe if the bacteria are taken from a place more used then more will grow on the spot of the dish where the tape was placed.

MATERIALS: petri dish, tape, marker, microscope, incubator, bacteria slide, nutrient agar, distilled water, crystal violet, close pin, inoculate, butzen burner, slide, beaker, staining tray, tissues, notebook PROCEDURE: Collecting bacteria: 1. First get all the materials that are needed. 2. Divide the petri dish into four equal parts, and number each section. 3. Take a piece of tape, about 1 ½ inch long and place it on the outside glass of the fish tank. Then tip over the petri dish so no water gets on the augar and open the cover of the dish. Quickly and gently place the piece of tape on the ogar, and then take the tape off, close the cover of the dish and throw the tape away. Do...