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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 ...
The structure and components of a human cell are given below: Cell membrane: Thin layer of protein and fat that surrounds the cell is the cell membrane. It is semipermeable, allowing some substances to pass into the cell and blocking others. Cytoplasm: Jelly-like material present outside the nucleus in which the cell organelles are located.
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).
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 ...
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.
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 ...
The cell wall is double layered, thin, delicate and flexible. It is composed of two complex polysaccharides, mannan (30%) and glucan (30-40%) with smaller quantities of protein (6-8%), lipid (8.5 – 10.5%) and chitin (2%). Cellulose is absent. Inner to cell wall is a cytoplasmic membrane or plasma membrane.
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.
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 ...
