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I. Cell Wall: Cell wall of most algae is cellulosic. It also contains hemicellulose, mucilage, pectin and other substances like alginic acid, fucoidin, fucin, calcium carbonate, silica etc. in different combinations in different groups of algae. Electron microscopic studies reveal that the cellulosic wall is composed of cellulose microfibrils ...
Bacterial cells (prokaryotic cells) are structurally much simpler than eukaryotic cells and the two cell types are compared in Table 3.2. They consists of various cell surface structures, cell wall, plasma membrane, many cytoplasmic inclusions, and the bacterial chromosome (nucleoid). Except some, all structures do not occur in every genus.
Cell Structure of Cyanophyceae (With Diagram) In this article we will discuss about the cell structure of cyanophyceae with the help of diagrams. The cyanophycean cells are prokaryotic in nature, which rarely exceeds 10p in diameter. Each cell consists of outer covering of cell envelop which surrounds the membrane covered protoplast (Fig. 3.24C).
B. Cell Wall: It is present between the slime layer and plasma membrane. It is a rigid and complex structure and resembles the cell wall of bacteria. It is made of four layers. Carr and Whitton (1973) named all these four layers as L I, L II, L III and L IV (Fig. 4 A). L I is a transparent space and occurs between the L II and plasmembrane.
The cell wall is followed by a bilayer membrane called plasma membrane or plasma lemma. It is 70A thick, selectively permeable and maintain physiological integrity of the cell. Plasma membrane sometimes invaginates locally and fuses with the photosynthetic lamellae (thylakoids) to form a structure called lamellosomes (Fig.4.32).
This will also help you to draw the structure and diagram of cell structure of yeast. The yeasts are unicellular fungi. Cells may remain attached in short chains forming a pseudomycelium, but they do not produce true mycelium. The cells are extremely variable in shape being globose, oval, elongated, or rectangular.
Cell Structure of Mycoplasma. 1. History of Mycoplasma: Mycoplasmas are the “smallest, independently replicating prokaryotes”. These organisms were first discovered by Pasteur in eighteenth century when he studied the causative agent of the “Bovine pleuropneumonia” (A pulmonary disease of cattle which appeared in Germany and Switzerland ...
The basic structural constituent of the cell wall in the Zygomycetes and higher fungi (Ascomycetes and Basidiomycetes) is chitin. It is a polysaccharide based on the nitrogen containing sugar (glucosamine). It is probable that more or less closely associated with chitin in the cell wall are pectic materials, protein, lipids, cellulose, callose ...
In this article we will discuss about the cell structure of bacteria with the help of diagrams. A bacterial cell (Fig. 2.5) shows a typical prokaryotic structure. The cytoplasm is enclosed by three layers, the outermost slime or capsule, the middle cell wall and inner cell membrane. The major cytoplasmic contents are nucleoid, plasmid, ribosome ...
1. Fritsch, F. (1935) defined algae as the holophytic organisms (as well as their numerous colourless derivatives) that fail to reach the higher level of differentiation characteristic of the archegoniate plants. 2. Smith, G. M. (1955) defined algae as simple plants with an autotrophic mode of nutrition. 3.
