BIO 102 Lecture Notes - Lecture 9: Diatomaceous Earth, Brown Algae, Alginic Acid
11 Oct 2016
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Pigments: chlorophyll a and b and carotinoids. Secondary endosymbiosis: another eukaryotic host takes in eukaryotic alga as an endosymbiote. This (cid:374)e(cid:449) (cid:862)chloroplast(cid:863) has the dna of the origi(cid:374)al chloroplast as (cid:449)ell as the dna remnants of the first eukaryotic nucleus. Secondary host discards the parts of the first endosymbiotic host. Cell walls: alginic acid and other polysaccharides. Cell wall has 2 overlapping silica/glass shells with intricate patterns. Some float in plankton, others live on rocks in cool ocean environments. One of the most important sources of energy/carbon in freshwater habitats. Cell protected by cell wall made of caco3 (chalk) Because cell wall is chalk blooms can make waters look turquoise. Some species can produce toxins that make animals/people sick. Unicellular with 2 flagella 1 around middle. Cell protected by cell wall made of cellulose. O(cid:448)ergro(cid:449)th ca(cid:374) cause (cid:862)red tides(cid:863), ofte(cid:374) poiso(cid:374) si(cid:374)ce (cid:373)a(cid:374)(cid:455) di(cid:374)oflagellates produce (cid:374)euroto(cid:454)i(cid:374)s. Algin: thickening agent in food processing (brown)
