Bacteria and Antibiotics

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What is LPS (lipopolysaccharide)?

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A component found in the outer membrane of Gram negative bacteria, important for their structural integrity and immune response.

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What are Gram positive bacteria?

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Bacteria that have a thick peptidoglycan layer in their cell wall, retaining the crystal violet stain used in Gram staining.

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What are Gram negative bacteria?

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Bacteria that have a thin peptidoglycan layer and an outer membrane, which does not retain the crystal violet stain.

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What is the significance of Gram staining?

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A method used to classify bacteria into two groups (Gram positive and Gram negative) based on their cell wall composition.

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What is transformation in bacteria?

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A process of gene transfer where a bacterium takes up free-floating DNA from its environment.

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What is transduction in bacteria?

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A process of gene transfer where bacteriophages (viruses that infect bacteria) transfer DNA from one bacterium to another.

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What is conjugation in bacteria?

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A process of gene transfer where two bacteria connect and transfer genetic material through a pilus.

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How do Gram negative bacteria affect antibiotic treatment?

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They can impede treatment due to their outer membrane, which can act as a barrier to certain antibiotics.

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What are the characteristics of nonliving bacteria?

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Bacteria are considered living organisms; however, viruses, which are nonliving, can infect bacteria.

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What is the role of plasmids in bacteria?

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Plasmids are small, circular DNA molecules that can carry genes, including those for antibiotic resistance.