Bacterial Cell Envelope Structure — NEET Biology
📚 Practice ConceptMost prokaryotic cells, particularly the bacterial cells, have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane. Although each layer of the envelope performs distinct function, they act together as a single protective unit. Bacteria can be classified into two groups on the basis of the differences in the cell envelopes and the manner in which they respond to the staining procedure developed by Gram viz., those that take up the gram stain are Gram positive and the others that do not are called Gram negative bacteria.
Match the following components of a bacterial cell (Column I) with their characteristic or function (Column II): Column I: Component A. Glycocalyx B. Cell wall C. Plasma membrane D. Mesosome E. Plasmid DNA F. 70S Ribosomes Column II: Characteristic/Function i. Acts as the site for protein synthesis ii. Provides strong structural support and prevents bursting iii. Facilitates resistance to antibiotics iv. Involved in DNA replication and respiration v. Selectively permeable and structurally similar to eukaryotes vi. Outermost protective layer, may be slime layer or capsule
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