BotanyExamFinal.txt

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BotanyExamFinal.txt
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    • author "Anonymous"
    • tags "Plant Biology joshua buck "
    • description "Plant Biology"
    • fileName "Algae.txt"
    • freezingBlueDBID -1.0
    • Is Algae a prokaryote or eukaryote?
    • Prokaryote,
    • •No nuclear envelopes
    • •No membrane-bound organelles, such as plastids, mitochondria, dictyosomes, endoplasmic reticulum
  1. How does algae reproduce?
    • •Fission/asexual - No mitosis, DNA strand duplicates and is distributed to new cells.
    • vNo sexual reproduction
    • •Genetic recombination facilitated by pili or by close contact of cells.
  2. Name some distinctions betwen cyanobacteria and traditional bacteria
    • Cyanobacteria have chlorophyll a and oxygen is produced from photosynthesis.
    • Contain phycobilins (blue and red pigments).
    • Can both fix nitrogen and produce oxygen.
  3. What are some characterists of blue-green bacteria? (Cyanobacteria)
    • Can live in extreme heat
    • First photosynthic organism

    • •Symbiotic with other organisms
    • –Amoebae, sea anemones, fungi (producing lichens), cycads
    • -mutialism.
    • cycads have amoebae
    • -can be found in fresh water as well
  4. Cyanobacteria is the main principal photosynthic organism in plankton.
    Y
  5. Describe cyanobacteria form, metabloism and reproduction
    • •Often in chains, or colonies held together by gelatinous sheaths
    • •Cells blue-green in color in about half of the approximately 1,500 species.
    • •Produce nitrogenous food reserve - Cyanophycin
    • •Flagella unknown

    • •New cells by fission, or by fragmentation of colonies or filaments.
    • •In Nostoc and Anabaena, fragmentation often occurs at heterocyst.
    • –Heterocyst - Large colorless, nitrogen-fixing cell
    • –Also produce akinetes
    • oAkinetes - Thick-walled cells that resist adverse conditions
  6. Describe history of cyanobacteria
    chloroplasts originated as cyanobacteria or prochlorobacteria living within other cells

    •Fossils of cyanobacteria, 3.5 billion years old, found in Australia.

    •3 billion years ago, cyanobacteria produced oxygen as by-product of photosynthesis.

    •Oxygen accumulated in atmosphere, becoming substantial 1 billion years ago.

    •As oxygen accumulated, other photosynthetic organisms appeared and forms of aerobic respiration developed.

    •In last half billion years enough ozone for UV shield and for photosynthetic organisms to survive on land.
  7. What are human relevance of cyanobacteria?
    Cyanobacteria=plankton, in which other animals eat= food systems!

    -algal blooms-poisonus to livestock

    Food=spirolina

    swimmers itch

    nitrogen fixation
  8. What causes Algal blooms?

    What toxins do they produce?
    High amounts of phorphorous and nitrogen

    • Microcystis produces
    • the toxin microcystin. Aphanizomenon can produce
    • multiple toxins including cylindrospermopsin, saxitoxin andanatoxin.
  9. What kingdom are Algae placed in?
    Kingdom Protista,

    Protista is diverse and heterogeneous
  10. What phylum does Green Algae belong?
    Phylum Chlorophyta
  11. What are characteristics of Green Algae?
    •Unicellular, filamentous, platelike colonies, netlike tubes, hollow spheres, lettuce-like leaves

    • •Greatest variety in freshwater lakes, ponds, and streams
    • –Some on tree bark, in animal fur, in snowbanks, in flatworms or sponges, on rocks, in lichen “partnerships.”
    • •Have chlorophylls a and b
    • •Store food as starch
    • •Most have a single nucleus per cell.
    • •Most reproduce both sexually and asexually.
  12. What is Chlamydomona?
    • Green Algae
    • •Common inhabitant of freshwater pools
    • •Unicellular (acellular?)Pair of whip-like flagella on one end pull cell through water-(helps this plant move)
    • Asexual and Sexual Reproduction

    • •Two or more vacuoles at base of flagella
    • –Regulate water content of cell and remove waste
    • •Single, cup-shaped chloroplast with one or two pyrenoids inside
    •      –Pyrenoids - Proteinaceous structures associated with synthesis of starch
    • •Red eyespot near base of flagella
    •       –Allows alga to swim toward light
  13. Describe Chlamydomona's asexual reproduction.
    Haploid is the basal state

    • –Nucleus divides by mitosis, and cell contents become two daughter cells within cellulose wall.
    •  
    • Each develop flagella and swim away.

    •  No change in chromosome number; all cells remain haploid.
    • -budding, spliting
  14. Describe Chlamydomona's sexual reproduction.
    Gametes fuse to form a diploid zygote. becomes zygospore, undergoes meiosis internally and split off haploid cells

    -Sooo only diploid for a very short amount of time.
  15. What is Ulotrix? and name characteristics
    -Green Algae,

    • •Filamentous with holdfast cell at one end
    • •Chloroplast - Wide, curved, somewhat flattened, with one to several pyrenoids.

    Reproduces asexually and sexually.
  16. What is Sprirogyra? Name Characteristics
    Green algae

    • •Filaments of cylindrical cells
    • •Chloroplast ribbon-shaped and spirally wrapped around vacuole, with pyrenoids at regular intervals.
  17. Describe reproduction of spirogyra.
    Asexual- breaks off and creates a new holdfast cell.

    • Sexual- By Conjugation
    • –Papillae fuse and form conjugation tubes.
    • –Protoplasts fuse, forming zygote that develops thick wall.
    • –Eventually zygote undergoes meiosis.
  18. What is Oedogonium? Name characteristics
    Green algae- with holdfast

    •Large netlike chloroplast with pyrenoids at intersections of net

    Asexual-fragmentation breaks apart grows new filamentous
  19. What is Chorella?  What is Desmid?
    Chorella- used for food source, that can be grown in culture. -only asexually

    • Desmids= important part of plankton
    • -reproduce by conjugation.
  20. What is hydrodicotyon?
    Green Algae, hexagonal meshes.

    • -
    • –Asexual reproduction, as well as isogamous sexual reproduction
    • –Isogamous = two flagellated gametes
  21. What is Volvox?
    •  
    • - Colonial green algae held together in a secretion of gelatinous material, resembling hollow ball

    • –Reproduction asexual or sexual
    • oSmaller daughter colonies formed inside parent colony
  22. What is Ulva?  Explain characteristics.
    • (sea lettuce) - Multicellular seaweed with flattened green blades and basal holdfast to anchor blades to rocks
    • –Haploid and diploid blades


    • oDiploid blades produce spores that develop into haploid blades.
    • oHaploid blades bear gametangia that form gametes. Gametes fuse to form zygotes that grow into diploid blades

    Exhibit isomorphism - Haploid and diploid blades indistinguishable
  23. What phylum does yellow-green, goldent-brown, diatoms, and brown algae belong?
    Phylum Chromophyta
  24. What is Vaucheria?
    Yellow-brown algae

    • –Oogamous, coenocytic, filamentous species
    • oAplanospores formed during asexual reproduction.Sexual reproduction rare
    • -Two flagella of motile cells are oriented in opposite directions
  25. Where would you normall find golden-brown algae?
    • •Most occur in the plankton of fresh water.
    • –Motile cells have two flagella of unequal length inserted at right angles to each other.
    • oPhotoreceptor on short flagellum.
  26. What are Diatoms? name characteristics of some.
    • •Unicellular
    • •Fresh and salt water, particularly abundant in cold marine habitats
    • •Also, dominate algal flora on damp cliffs, tree bark or buildings


    • •Look like ornate, glass boxes with lids
    • –As much as 95% of wall is silica.
    • •Chlorophylls a and c and fucoxanthin
    • •Food reserves - Oil, fats or laminarin
  27. Describe Asexual reproduction of Diatoms.
    • •Asexual reproduction results in half of cells becoming progressively smaller.
    • •Original cell size restored through sexual reproduction.
  28. What are characteristics of Brown algae?
    • •Relatively large; none unicellular or colonial
    • •Most marine; majority in cold, shallow water
    • •Many have a thallus differentiated into a holdfast, a stipe, and blades.
    • –Blades may have gas-filled bladders.
    • •Chlorophylls a and c, fucoxanthin
    • •Food reserve = laminarinAlgin Algin in cell walls
  29. What is sargassum?

    How does it reproduce?
    • Brown algae (Phaeophyceae)
    • •Sargassum - Floating brown seaweed
    • •Asexual reproduction by fragmentation or autospores.
  30. What is Fucus?
    Brown algae, common rockweed

    • –Sexual reproduction:
    • oReceptacles at tips of branches contain spherical chambers called conceptacles with gametangia inside.
    •  Oogonium produces 8 eggs.
    •  Antheridium  produces 64 sperm.
    • oEggs and sperm released into water.
  31. What phylum is Red algae? Name characteristics of red algae.
    Phylum Rhodophyta.

    •In warmer and deeper waters than brown algaeMost are filamentous with filaments so tightly packed they appear to have flattened blades or branched segments

    • •Relatively complex life cycle involving three types of thallus structures
    • •Nonmotile reproductive cells
  32. Kelp forests consist of what kind of algae?
    Brown algae
  33. what are some cool things about red algae?
    • •Colors mostly due to phycobilins.
    • –Similar to those of cyanobacteria
    • oRed algae may have been derived from cyanobacteria.
    • •Chlorophylls a, and sometimes d
    • •Food reserve - Floridean starch
    • •Numbers of species produce agar.
  34. What phylum is the dinoflagellates? Name characteristics.
    Dinophyta

    • vThe Dinoflagellates
    • •Red tides - Sudden multiplication of dinoflagellates
    • –Some produce neurotoxins that accumulate in shell fish.
    • •Cellulose “armor plates” inside cell membrane
    • •Two flagella in intersecting grooves
    • –One trails behind cell - Acts as rudder
  35. what are some cool things about dinoflaggelates?
    • •Most have disc-shaped chloroplasts.
    • –Contain xanthophyll pigments
    • –Chlorophylls a and c
    • •About 45% nonphotosynthetic
    • •Chromosomes remain condensed and visible throughout life of cell.
    • •Starch food reserve
    • Many have tiny projectiles that fire when irritated
  36. What are human ecological relevance to algae?
    • •Most have disc-shaped chloroplasts.
    • –Contain xanthophyll pigments
    • –Chlorophylls a and c
    • •About 45% nonphotosynthetic
    • •Chromosomes remain condensed and visible throughout life of cell.
    • •Starch food reserve
    • Many have tiny projectiles that fire when irritated
  37. What is Algin?
    • •Produced by giant kelps and other brown algae
    • –Ice cream, salad dressing
    • –Latex paint, textiles, ceramics
    • –Regulates water behavior
    • oControls development of ice crystals
    • oRegulates penetration of water
    • oStabilizes suspensions
  38. Minerals and food
    • •Iodine from kelp
    • •Red algae
    • –Food - Dulse, nori
    • –Carrageenan - Thickening agent
    • vAgar
    • •Produced by red alga Gelidium
    • –Solidifier of nutrient culture media
    • –Retains moistness in bakery products
    • –Base for cosmetics

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