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Questions and Answers
How are bacteria classified based on their response to the Gram stain?
How are bacteria classified based on their response to the Gram stain?
- Spherical and rod-shaped
- Gram positive and Gram negative (correct)
- Bacilli and cocci
- Aerobic and anaerobic
What is the outermost layer in the cell envelope of most prokaryotic cells?
What is the outermost layer in the cell envelope of most prokaryotic cells?
- Glycocalyx (correct)
- Plasma membrane
- Cell wall
- Capsule
What determines the shape of the bacterial cell?
What determines the shape of the bacterial cell?
- Plasma membrane
- Glycocalyx
- Cell wall (correct)
- Capsule
What provides a strong structural support to prevent the bacterium from bursting or collapsing?
What provides a strong structural support to prevent the bacterium from bursting or collapsing?
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What could the glycocalyx be in some bacteria?
What could the glycocalyx be in some bacteria?
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Study Notes
Bacterial Classification and Cell Envelope
- Bacteria are classified into two main groups based on their response to the Gram stain: Gram-positive and Gram-negative.
- The outermost layer in the cell envelope of most prokaryotic cells is the peptidoglycan (also known as murein) layer.
Cell Shape and Support
- The shape of the bacterial cell is determined by the peptidoglycan layer.
- The peptidoglycan layer provides a strong structural support to prevent the bacterium from bursting or collapsing due to osmotic pressure.
Glycocalyx
- In some bacteria, the glycocalyx can be a loose, irregular layer of polysaccharides and proteins, known as a capsule.
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