Chapter 3

2. Normal variability of cell shapes in a single species
6. bunches of flagella emerging from the same site
7. accessory structures that sprout from the surface of bacteria. They can be divided into two major groups: those that provide motility and those that enable adhesion
8. a category of bacteria cells that describes bacteria with outer membrane, a cytoplasmic membrane, and thin cell wall
11. short, numerous-surface appendage on some bacteria that provides adhesion but no locomotion
13. extensions of bacterial membranes that are channels for nutrients or energy exchange
14. long tubular structure made of pilin protein produced by gram-negative bacteria and used for conjugation
15. the tendency of organism to move in response to a chemical gradient ( towards an attractant or to avoid adverse stimuli)

1. Grape-like clusters of cells
3. single layer of thousands of copies of a single type of protein linked together on the surface of a bacterial cell that is produced when the cell is in a hostile environment
4. Chain of several cells
5. a helical structure composed of proteins that is part bacterial flagella
9. taxonomic category that have gram-positive cell envelopes
10. a category of bacterial cells that describes bacteria with a thick cell wall and no outer membrane
12. taxonomic category of bacteria that have gram-negative envelopes