BIOL 336 Lecture Notes - Lecture 13: Phycocyanin, Sporangium, Starch
28 Feb 2017
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General characteristics: mainly marine, mainly tropical and temperate, also in polar regions, 5000-6000 known species, morphology: Most are structurally simple: epiphytes (on seaweeds), on animals, on rocks, but few floating forms, some are parasitic, commercial importance: Pharmaceuticals (compounds that inhibit herbivory or microbial activity) Human food (porphyra: nori (sushi) or agar and carrageenans) Unicells, colonies, filaments, or sheets of cells. Multiaxial body: multiple filaments: cell covering: extracellular matrix (ecm) Less rigid than the cell walls of other algae and plants. Amorphous gel-like mixture (largest component: sulfated polymers of galactose and mucilages. Lack centrioles and flagella from vegetative cells, spores, and gametes. Insteads, have a polar ring or nuclear associated organelle (nao) occurs at the mitotic spindle poles. Nao: similar to centrioles in diameter and being associated with microtubules, but shorter___ Evolutionary compensation for loss of flagella: enhances reproductive fecundity. Function of pit plugs is not known. Primary pit plugs: occur between sister cells (a: structural link between cells.
