Notes Principles of Biology Nurtritional diversity

Notes Principles of Biology Nurtritional diversity - Notes...

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Notes Principles of Biology 02/10/14 Nutritional diversity Algae = any protist that is photosynthetic (plant-like) protists Protozoa = any protist that is ingestive (animal-like) protists Primary endosymbiosis: red and green algae Photosynthetic pigments: the light receptors Pigments are substances that absorb visible light Different pigments absorb different wavelengths Wavelengths that are not absorbed are reflected or transmitted Chlorophyll Chlorophyll a is the main photosynthetic pigment Accessory pigments, such as chlorophyll b and d, phycoerythrin (red algae), phycocyanin (cyanobacteria), carotenoids (brown/golden algae), broaden the spectrum used for photosynthesis Rhodophyta (red algae) Phycoerythrin (absorbs blue light, reflects red light) Can live at great depths (<200 meters) Mostly multicellular No flagellum Cyanidioschyzon merolae,
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Unformatted text preview: a unicellular red alga • Small alga (2 mm diameter) • One plastid and one mitochondrion • First complete algal genome (released in 2004) • (17 Mb; 20 chromosomes; 5,331 genes) • Calvin cycle enzymes are identical in plants • Additional evidence that primary endosymbiosis occurred • before the separation of the red and green algae lineages • Nucleoulus stains in electron microscopy Chlorophyta • Green pigment-Chlorophyll ( a + b ) • Plant-like chloroplast • Complex life cycles (with sexual and asexual reproductive stages) Chlamydomonas reinhardtii, a unicellular green alga • Bi-flagellated • Large genome (100 Mb) • Model organism for the study of photosynthesis • Great for genetic analyses, photosynthetic mutants can grow in presence of acetate...
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