The mucus seen in chronic bronchitis patient is derived from which of the following cell types?
Large periplasmic space
Presence of capsule
Presence of outer membrane
Thick peptidoglycan layer
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.