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FLAGELLUM - 2 Allow bacteria to adhere to the surface of...

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FLAGELLUM (FLAGELLA) 1. Properties: a. Long, thin, thread-like appendage b. Attached to the cell membrane from a basal granule 2. Function : a. Responsible for motility b. Rotates clockwise or counter clockwise c. Chemotaxis - movement toward nutrients, away from harmful chemicals 3. Composition : Protein called flagellin 4. Number and Location: a. Number - single, two, or more b. Location - at one end, both ends, all over cell 5. Found only on some bacilli, spirals 6. Requires special stain to demonstrate PILUS (PILI) 1. Properties: a. Thin, shorter, hair-like appendages b. Vary in length c. Extend from entire surface of cell d. Two types: 1). Attachment pili 2). Conjugation (sex) pili 2. Composition : Protein - pilin
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3. Function : a. Attachment pili : 1). Shorter in length
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Unformatted text preview: 2). Allow bacteria to adhere to the surface of mucus membranes and to each other 3). Enables the cells to colonize 4). Enhances the bacterias ability to cause disease b. Conjugation (sex) pili 1). Longer 2). Allows two bacteria to adhere to each other 3). Provides a pathway for a segment of DNA to be transferred from one cell to the other (conjugation) PLASMIDS 1. Properties : a. Small circles of DNA b. Are not connected to the nucleoid 2. Function: a. Contains genetic information that is not essential to the cells survival b. May contain genes for R factors (drug resistance), toxins c. May be involved in conjugation d. Used in genetic engineering...
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