Biol 152 1st Edition Lecture 7 Current LectureI. Protista A. Habitat 1. Primarily a forest environment 2. Rainfall moderate to high3. Forest litter, fallen trees, decaying stumps4. Also in flower beds, lawns, and in the bark of living treesB. Importance of alga1. Produce food and oxygen2. Provide habitat for other organisms 3. Medical and PharmaceuticalC. Reproduction 1. Alternation of Generationsa. Life cycle divided into two distinct stages b. One organism is haploid- 1 set of chromosomes c. The other is diploid- 2 sets of chromosomes d. One is produced by sexual, and the other by asexual reproductionD. Classification of alga 1. Dinoflagellates (Pyrrophyta) == ALVEOLATAa. Unicellular b. Marine and fresh waterc. Chlorophyll a and bd. Cellulose or absent, coated with silica e. Some effect against mouse leukemia and human carcinoma 2. Diatoms (Chrysophyta)== STRAMENOPILAa. Planktonic formsb. Unicellular and colonial These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.c. Golden yellow pigmentd. Chlorophyll a and c e. Cell wall of silicaf. Used in metal polish, toothpaste, swimming pool filters, TNT 3. Euglenoids (Euglenophyta)a. Marine and Freshwaterb. Single-Celled with double lifestyle c. Photosynthetic or heterotrophic d. Chlorophyll a and b e. 1-3 tinsel flagella 5f. No cell wallg. Sexual reproduction4. Brown algae (Phaeophyta)== STRAMENOPILAa. All marine, multicellular b. Chlorophyll a and c c. Cellulose, alginic acidd. Mostly sexual reproduction e. Meiosis produces spores instead of gametes f. Sulfated polysaccharides show some anti HIV activity 5. Red algae (Rhodophyta)a. Mostly marineb. Mostly multicellular no flagella c. Chlorophyll a and d d. Cellulose, pectin, calcium 6. Green Algae (Chlorophyta) a. Green alga-like ancestor of plantsb. Mostly fresh water, few marine c. Chlorophyll a, b, carotenoidsd. Polysaccharides including cellulose e. Mostly no flagella f. Some symbiotic with animals and fungiE. Alginic Acid1. Used fora. Thickening, suspending, stabilizing, emulsifyingb. Ice cream and other dairy products c. Shaving cream, rubber paintd. Dental impression of teeth e. Agar: used for thickening, suspending and stabilizing F. Agar 1. Used for a. Cosmetic skin preparations, ointments, and lotions b. Photographic film c. Shoe