Chapter 9- Microbial Growth

2. the cloudiness of a sample of bacteria in a liquid suspension
3. ___ time is the time it takes for the population to double through one round of binary fission
6. microorganisms that grow best at pH between 8.0 and 10.5
7. the laboratory instrument used to measure turbidity
9. cell forms a long narrow extension, it swells into a smaller new cell and detaches from parent cell
10. ____ fission is the most common mechanism of cell replication in bacteria
16. ____ density is defined as the number of cells per unit volume
20. ___ medium contains a low percentage of agar to allow motile bacteria to move throughout the medium
21. ____ sensing is the mechanism by which cells in a biofilm coordinate their activities in response to environmental stimuli
22. In some cyanobacteria, many nucleoids may accumulate in an enlarged round cell or along a filament, leading to the generation of many new cells at once before they slip from parent cell

1. are bacteria that require a minimum level of oxygen for growth, about 1%–10%, well below the 21% found in the atmosphere
4. cells that are characterized by a slow metabolic rate
5. this phase is where the rate of cell division and death roughly equal
8. Free-floating microbial cells that live in an aquatic environment
11. complex and dynamic ecosystems that form on a variety of environmental surfaces by bacteria to help with survival
12. ____ plate count, is a count of viable live cells by observing colonies
13. ___ cell count refers to counting the cells in a liquid culture or colonies on a plate
14. converts hydrogen peroxide to water and oxygen
15. divides the two daughter cells
17. this phase is where there is no growth in living cells, cells are introduced into new environment
18. The process of cytokinesis and cell division is directed by this protein
19. enzyme used in reactions where an electron donor (reduced compound; e.g., reduced nicotinamide adenine dinucleotide [NADH]) oxidizes hydrogen peroxide, or other peroxides, to water