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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.
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 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.
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 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.
Cell Structure of Cyanobacteria: Cyanobacterial cells are larger and more elaborate than bacteria. Cell structure is typically prokaryotic— one envelope organisation with peptidogly can wall, naked DNA, 70S ribosomes and absence of membrane bound structures like endoplasmic reticulum, mitochondria, Golgi bodies, plastids, lysosomes, sap vacuoles.
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.
In this branching system the whole thallus remain attached to the substratum by a basal cell and the branches may arise from any cell of the filament except the basal cell, e.g., Cladophora (Fig. 3.5B). Heterotrichous Habit: In this branching system the whole thallus is differentiated into prostrate and erect system.
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).
