The mucus seen in chronic bronchitis patient is derived from which of the following cell types?
Correct Answer: Thick peptidoglycan layer
Description: The peptidoglycan layer in the cell wall of gram-positive organisms is much thicker than that in gram-negative organisms, and is thought to contribute to the gram-positive staining reaction. A large periplasmic space and an outer membrane are characteristics of gram-negative cell walls. Capsules can be seen in both gram-positive and gram-negative species. Also Know: Gram stain: This staining procedure, developed in 1884 by the Danish physician Christian Gram, is the most impoant procedure in microbiology. It separates most bacteria into two groups: the gram-positive bacteria, which stain blue, and the gram-negative bacteria, which stain red. The organic solvent, such as acetone or ethanol, extracts the blue dye complex from the lipid-rich, thin-walled gram-negative bacteria to a greater degree than from the lipid-poor, thick-walled gram-positive bacteria. The gram-negative organisms appear colorless; the gram-positive bacteria remain blue. Ref: Levinson W. (2012). Chapter 2. Structure of Bacterial Cells. In W. Levinson (Ed), Review of Medical Microbiology & Immunology, 12e.
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