BIOL 336 Lecture 8: January 30th 2017
31 Jan 2017
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Document Summary
They have ejectisomes (will see later what this is for: distinguished from other cells by a nucleomorph, which is evidence of secondary symbiosis. Nucleomorph is the remnant of a red alga nucleus. Nutrition: mixotrophic- autotrophic + , most require vitamin b12 and thiamine, some biotin, phagotrophy in one pigmented and in various colorless forms. One flagellum: stiff, the other propels the cell. Flagellar root system: microtubules and cytoskeleton proteins. Emerge neat vestibulum (anterior depression) on ventral cell surface. Contractile vacuole empties into vestibulum: ejectisomes. Violently discharged into the vestibulum (defensive response to herbivores?) (sometimes discharge causes the cell to burst) Cells may disintegrate from massive discharge (due to sudden environmental shock or preservatives: light sensitive system. Can change position in response to light. Numerous hexagonal, rectangular, oval, or round organic (protein) plates beneath and above the plasma membrane. Not much known about function, adds rigidity: plastids. Secondary endosymbiosis (red alga ingested by colorless.
