Term
| What primarily defines bacteria? |
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Definition
- cellular structure
- small size |
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Term
|
Definition
1. defined nucleus surrounded by nuclear membrane
2. membrane bound cellular organelles (eg. mitochondria, chloroplasts) |
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Term
| How is the bacterial genetic material organized? |
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Definition
| It is supercoiled circular DNA in the cytoplasm. |
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Term
| Do bacteria carry out respiration and photosynthesis? |
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Definition
Yes!
(by modifications in their cell membrane) |
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Term
| How do bacterial ribosomes compare to those of higher cells? |
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Definition
| They are structually different and inhibited by many broad-spectrum antibiotics. |
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Term
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Definition
| It is the component of most bacterial cell walls. |
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Term
| What is the average size of a bacterium? |
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Definition
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Term
What are the
3 morphological types of bacteria? |
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Definition
1. bacilli (rods)
2. cocci (spherical)
3. spirals (curved rods) |
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Term
| What type of ends can bacilli (rods) have? |
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Definition
- rounded
- flat
- tapered |
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Term
| Motility wise, how can bacilli (rods) be? |
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Definition
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Term
|
Definition
- singly
- chains
- tetrads
- irregular masses |
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Term
| Why are most cocci non-motile? |
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Definition
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Term
| How can the spiral bacteria exist? |
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Definition
- slender spirochetes
- spirillium
- comma-shaped curved rod (vibrio) |
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Term
|
Definition
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Term
| What do spirochetes use for motility? |
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Definition
Axial filaments
(type of flagella that originate from both ends of the cell and wrap around the cell body). |
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Term
| What kind of motion do spirochetes move in? |
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Definition
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Term
| In what ways do microscopic features of bacterial colonies biffer from that of molds? |
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Definition
- bacterial colonies: smooth, small
- fungal colonies: large, "fuzzy" |
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Term
| Why is the level of contamination measured as # colonies rather than size of colonies? |
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Definition
- Colony size reflects
growth rate and motility
- # colonies reflects # cells originally present and the level of contamination. |
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Term
| Should one be concerned to find molds on the skin? |
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Definition
| Yes, they are likely transient contaminants from the environment. |
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