BIOB 170 Week 5 and 6
BIOB 170 Week 5 and 6 BIOB 260 - 00
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This 3 page Class Notes was uploaded by Isabella Sturgeon on Sunday March 20, 2016. The Class Notes belongs to BIOB 260 - 00 at University of Montana taught by Scott Samuels (P), Mark Lindsay Grimes in Fall 2016. Since its upload, it has received 12 views. For similar materials see Cellular and Molecular Biology in Biology at University of Montana.
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Date Created: 03/20/16
Week 5 and 6 BIOB 170 Notes Eukarya Contd. Brown Algae Contd. • Life cycle o Some display Alternation of generations o Distinct multicellular stages § Sporophyte: diploid • Produced haploid spores • Spores germinate to gametophyte § Gametophyte: haploid • Produces gametes • Gametes fuse • Embryo grows into sporophyte § Spores can turn into algae § Gametes fuse with other gametes Oomycota- water molds • Freshwater, marine, moist land • Parasitic, saprophytic • Non-fungal o Cell walls have cellulose (Fungi possess chitin) o Flagellate cells in life cycle (fungi don’t have these o Can live in salt o Saprophytes kill fish which helps ecosystem o Terrestrial: phytopthera Rhizaria (Super group 3) • Aquatic, marine freshwater • Planktonic or benthic • Formerly grouped with ameobas • Distinguished by pseudopodia • 2 groups o Foraminiferans § CaCO3 test § Benthic o Radiolarians § SiO2 test § Planktonic Archaeplastida (Super group 4) • Direct descendants of primary endosymbiosis • Red algae (Rhodophyta) o Marine mostly o Not all red o Unicellular mainly, filamentous, branching, parenchymous o No flagellated stages o Ps pigment: phycoerythrin absorbs blue and green wavelengths o Understory component in marine blue light has shorter wavelength so it penetrates deepest o Can live deep down § Pophyridium: unicellular § Porphyra: larger, cultivated as nori § Chronus: “Irish Moss”: branching/ parenchymous growth, source of carrageenan: emulsifier, medical use for bronchial infections § Coralline forms: CaCO3 in cell walls, encrusting or branching, stabilizes coral reefs • Hildenbrandia: encrusting • Corallina: branching • Green algae (Chlorophyta) o Ps pigment o Chlorophyll a and b o Use starch for energy storage o Includes progenitor o Chlorophaceae § Most diverse and abundant § 7000 or more species § Fresh water dominant § 4 morphological groups • 1. Flagellated o Chlamydomonas- unicellular, makes snow red § Haplontic § Zygote pigmented for UV protection o Volvox, Pandorina- colonial • 2. Non- Flagellated o Chlorocoxum- unicellular § Terestrial § Free living o Pediastrum, Scenedesmus- colonial § Disks § Suspended in water § Spines facilitate suspension • 3. Parenchymous o Ulva “sea lettuce” • 4. Coencytic o Caulerpa § Marine weed § Single cell § Mitosis but not cytokinesis o Charophyceae § Close relation to today’s land plants • Cell division • Biochemistry • Chloroplast structure § No flagellated forms § 1. Unicellular • Desmids § 2. Filamentous • Spyrogyra • Blanket weed • Floats on the surface § 3. Plant like • Stone warts • Chara • Nitella • Multicellular • Looks like a plant • Charophyceae- model genus for land plants
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