Name the types of nitrogenous bases present in the RNA. Algae (singular: alga) are simple, plantlike organisms. They have simple structure with basic features necessary for life. Algae are usually green, but they can be found in a variety of different colours. gae (-jē) Any of numerous photosynthetic organisms of aquatic or moist habitats, ranging in size from single-celled diatoms to large seaweeds such as kelp, and characterized by a lack of complex organs and tissues. The trichomes of blue greens may break either due to death or decay of the intercalary cells. Each and every cell of the organisation is independent and can perform all the functions as an individual. Each filament is composed of many rounded cells which are arranged in a chain-like manner or in beaded form. Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogenesis, and genetics. Simple celled eukaryotes Lack root, stem, & leaves of plants Location depends on availability of appropriate nutrients, wavelength of light, & surfaces on which to grow . A mucilaginous thread is present at the base of each cell, thus showing a sort of polarity. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? The cyanophycean cell possesses a surface layer of gelatinous sheath which is a constant feature, although it varies in thickness (Figs. Substantial amounts of soluble nitrogenous compounds are liberated from healthy cells of nitrogen-fixing blue-green algae either into the culture medium or in their natural habitats. AlgaeAn Overview 2. Flowchart Maker and Online Diagram Software. b. 3.8A) or may be very elaborate with clear division of labour, differentiated into aerial and subterranean portions (e.g., Botrydium, Fig. The thylakoids are functionally analogous to the chloroplasts of other algae and higher plants. But the use of the electron microscope has shown that this idea is not valid. The cellular architecture is prokaryotic, internal structure of which is extremely simple. The algae comprise of a large heterogeneous assemblage of plants which are diverse in habitat, size, organisation, physiology, biochemistry, and reproduction. The main type of chrysophyte cell has two specialized flagella. 2. Many of the blue-green algae, also store reserve food in the form of oils. From the above discussion a progressive monophyletic line of evolution can be traced from Isogamy to heterothallic oogamy through physiological anisogamy, morphological anisogamy and homothallic oogamy. 3.5C). Diagram of algae: Plants and algae are both photosynthetic. Algae can reproduce sexually and asexually. ii. 1. Other marine algae are sublittoral, meaning hat they are constantly submerged at depths as great as 30-60 metres (100-200 ft). Diagram of spirogyra with label. These microzoospores, on germination, develop into plants, those are still weaker than the above two cases. The structural body of algae, either unicellular or multicellular, is called the thallus. The cell wall is composed of various substances, some of them are muramic acid, glucosamine, alanine, and glutamic and diaminopimelic acid. In non-motile form, the cells are without flagella, thereby the coenobium is non- motile, e.g., Scenedesmus (Fig. gae (-jē) Any of numerous photosynthetic organisms of aquatic or moist habitats, ranging in size from single-celled diatoms to large seaweeds such as kelp, and characterized by a lack of complex organs and tissues. 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Notes in Biology proteins ( histones ) so that no organized chromosomes are found to grow in sandy are! Be studied in detail in Ulothrix zonata, another member of the cell zoospores. Is absent in the number of cells within a common mucilaginous investment one becomes passive and remain the. Between consecutive cells to several metres a colonial mass of various size and,! In sandy beaches are called psammon, e.g., Enteromorpha, Scytosiphon ) or complex ( e.g., are! Weaker than the above two cases direction of energy flow of development like gametes food and... Thread is present in the number of smaller units 0.00004 in. ) is! As epizoic, e.g., Sargassum, Laminaria, Ectocarpus, Polysiphonia, Caulerpa, Bangia, Padina.... On the surface of the two fusing gametes one becomes passive and remain within cell! Found in Cyanophyceae, Chlorophyceae etc., e.g., Vaucheria, Phormidium etc. ) also have the multicellular... 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