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Questions and Answers
What is the defining characteristic of gram-positive bacteria in the Gram stain test?
What causes gram-negative bacteria to appear pink in the Gram stain test?
What component of gram-positive bacteria's cell wall retains the crystal violet stain?
What happens to the crystal violet stain in gram-negative bacteria during the Gram stain test?
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What distinguishes the cell wall structure of gram-negative bacteria from gram-positive bacteria?
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What enabled Robert Hooke to distinguish and name cells for the first time?
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What is the main difference between the plant cell wall and the extracellular matrix produced by animal cells?
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What happens to the ability of plant cells as a result of evolving relatively rigid walls?
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What is the origin of all cell walls in plants?
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What is the defining characteristic of the plant cell wall?
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Study Notes
Gram Stain Test
- The defining characteristic of gram-positive bacteria in the Gram stain test is the retention of the crystal violet stain.
- Gram-negative bacteria appear pink in the Gram stain test due to the decolorization of crystal violet by ethanol.
- The peptidoglycan layer in gram-positive bacteria's cell wall retains the crystal violet stain.
- In gram-negative bacteria, the crystal violet stain is washed out by ethanol during the Gram stain test.
Cell Walls
- The cell wall structure of gram-negative bacteria is distinguished from gram-positive bacteria by the presence of a thinner peptidoglycan layer and an outer membrane.
- Robert Hooke was able to distinguish and name cells for the first time using a light microscope.
- The main difference between the plant cell wall and the extracellular matrix produced by animal cells is that the plant cell wall is rigid and composed of cellulose, whereas the extracellular matrix is flexible and composed of various proteins and carbohydrates.
- The evolution of relatively rigid walls in plant cells resulted in a loss of ability to move and change shape.
- All cell walls in plants originate from the embryonic cell layer.
- The defining characteristic of the plant cell wall is its rigidity, which is provided by the cellulose fibrils.
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Description
Test your knowledge of bacteriology with this quiz on gram-positive bacteria. Learn about their characteristics and classification based on the Gram stain test.
