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Questions and Answers
Which of the following methods is used to determine the genetic characteristics of bacteria?
Which of the following methods is used to determine the genetic characteristics of bacteria?
- HPLC
- Serological tests
- Gram staining
- rRNA typing (correct)
What is the singular form of 'cocci'?
What is the singular form of 'cocci'?
- Cocc
- Coccus (correct)
- Coccia
- Coccum
What size range do bacteria generally fall into?
What size range do bacteria generally fall into?
- 1µm to 100µm
- 100µm to 1000µm
- 0.2µm to 10µm (correct)
- 0.02µm to 1µm
Which of the following is NOT a shape of bacteria?
Which of the following is NOT a shape of bacteria?
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Which characteristic is detected using Gram and acid-fast staining techniques?
Which characteristic is detected using Gram and acid-fast staining techniques?
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Which of the following is not a growth characteristic used in bacterial classification?
Which of the following is not a growth characteristic used in bacterial classification?
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Study Notes
Bacterial Classification
- Bacterial classification involves biochemical profile, serological tests, metabolic end products, genetic analysis, G-C content, and staining characteristics like Gram and acid-fast staining.
Bacterial Morphology
- Bacteria can be classified into different shapes:
- Cocci (singular: coccus)
- Bacilli (singular: bacillus) or rods
- Other shapes include:
- Ovoid
- Tapered
- Curved
- Spiral
- Hyphae-like structures
Bacterial Size
- Bacteria range in size from 0.2µm (Chlamydiae) to 10µm
- The smallest bacteria are at the limit of resolution of the light microscope
Cellular Arrangements
- Bacteria can form different arrangements:
- Clusters
- Chains
- Diploid
- Tetrads
- Palisades
Other Characteristics
- Motility: presence or absence of movement
- Spore formation: presence or absence of spores
- Growth characteristics:
- Speed of growth
- Morphology on selective and non-selective media
- Atmospheric requirements
- Temperature requirements
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