Which bacterial structure is primarily responsible for retaining crystal violet during Gram staining in Gram-positive bacteria?
Correct answer: C. A thick peptidoglycan layer
- A. A thin peptidoglycan layer
- B. An outer lipopolysaccharide membrane
- C. A thick peptidoglycan layer
- D. A capsule rich in polysaccharides
Explanation
Gram-positive bacteria have a thick peptidoglycan layer that traps the crystal violet iodine complex during decolorization. Gram-negative bacteria instead possess a thin peptidoglycan layer and an outer membrane containing lipopolysaccharide.
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Covers the structure, classification, growth and transmission of bacteria, viruses, fungi and other disease causing microorganisms in animals. It explains innate and acquired immunity, antibodies, antigens, vaccination, hypersensitivity and diagnostic methods, while distinguishing infectious agents from the immune responses they produce.
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