Like bacteria, the cell of cyanobacteria also consists of a mucilaginous layer called sheath, the cell wall, plasma membrane and cytoplasm. These are shown in Fig. 4.32 and described below: 1. Sheath: Usually the cell of cyanobacteria are covered by a hygroscopic mucilaginous sheath which provides protection to cell from unfavourable conditions and keeps the cells moist (Fig. 4.32). Thickness, [...]
In this article we will discuss about the chemical compositions of cell wall in various bacteria’s. The cell wall of bacteria is made up of network of peptidoglycan (murein, mums means wall). It is present almost on all bacterial cell wall except Halo-bacterium and Halo-coccus. Because these bacteria live in marine water which contains high salt concenÂtration. The osmotic pressure [...]
In this article we will discuss about the presence of pigments in photosynthetic bacteria. Because of the presence of carotenoids in all photosynthetic tissues their role is anticipated in photosynthesis. The tissue/cells rich in carotenoids devoid of chlorophyll do not photosynthesize. Light energy absorbed by carotenoids appears to be transferred to chlorophyll a or bacteriochlorophyll a and utilized in the [...]