Transcript Chapter 26

Virus Quiz
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Are Viruses living? Why or Why not.
Explain the 2 ways viruses reproduce.
Can viruses infect animals, plants and bacteria?
Draw and label a bacteriophage
List 4 examples of viruses or diseases caused by
viruses
You have 20 minutes
General Protozoa Info
-Eukaryotic organism / Protista Kingdom
-Single Celled or Multi-Celled
-About ½ of known species are extinct (fossils)
-Free living, colonial or parasitic
-“Catchall kingdom..”
Simple Creatures?
Simplest Eukaryotes?
As a whole; simple (compared to humans)
On a cellular level; complex (no
specialization) carry out ALL FXNs
General Characteristics
(How are they classified)
Animal Like (heterotrophs), Plant Like (photosynthesis) or Fungus
Like (decomposers)
Where do they Live?
aquatic environments (water, soil, body fluids)
How they move?
Flagella (Zooflagellates {Giardia & Trichonympha}
Pseudopodia (Amoeba, Forams)
Cilia ( Paramecium)
No movement- plasmodium, apicomlexans
movements
17.4 Graphic Organizer
Cell Wall
Euglenoids
Dinoflagellate
Diatom
Seaweed
Brown Algae
Seaweed
Red Algae
Seaweed
Green Algae
Photosynthetic
Pigments
Structure
Examples
Protist Drawings and Microscopy!
10X- Euglena
Eyespot
Green- photosynthesis
PLANT LIKE
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Magnification
Name of Organism
Key Characteristics
Movement
Classification
What you need for each
Slime Molds!
1.Plasmodial
2.Cellular
3.Water molds
4.Downy Mildew
17.3 Slime Molds
• Not “mold” (type of fungus)
• Plasmodial Slime Molds
– Single mass of cytoplasm with many nuclei
– Thrive in moist areas of decaying matter
– Pseudopodia engulf organic matter (streaming)
– Water/food shortage – fruiting bodies (sporangia)
• Meiosis produces haploid spores
• Good conditions – spore release active haploids, fuse
together to form diploid zygotes new plasmodium
Cellular Slime
Molds
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Also decomposers
Both unicellular and multicellular life
cycles
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3 life cycles (individual, colony and spore)
Most of time- amoeba like haploid cells
Scarcity of food- form colony (multicell)
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Secrete chemicals
Form haploid spores (asexual)
Both asexual and sexual
Water Molds & Downy Mildews
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Different from slime molds but fungal-like
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Still heterotrophic & fungus like
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Water Molds- freshwater, decompose & parasitic
on gills or skin
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Unicellular or branching filaments
Reproduce sexually (motile spore w/flagella)
Downy Mildew- some parasitic (potato famine)
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Asexual and sexual
17.4 Algae & Algae Like
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Photosynthetic Protists (plant like)
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Chloroplasts
Unicellular, colonial, multicellular
Asexual and sexual mechanisms
Classified by :
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Cell Wall,
Types of Photosynthetic Pigments, Structure,
Storage Carbohydrates,
Nucleic Acid
Euglenoids
Single Celled
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1-2 flagella
Lack cell walls
Chloroplasts for
photosynthesis
Live in freshwater
Plasma membrane- tough
and flexible
Eyespots
Can be heterotrophic if
needed
Dinoflagellates
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Unicellular
Photosynthetic
Cell wall made out of cellulose
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2 perpendicular flagella (dinos)
Freshwater & saltwater
Phytoplankton and Zooplankton
Red-tides
Bioluminescence
Diatoms
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Glass-like cell wall (silica)
Unicellular
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Chlorophyll and other pigments (brown
yellow color)
Freshwater and saltwater
Diatomaceous earth
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Seaweeds
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Large, multicellular marine algae
Lack true roots and vascular systems
Brown, Red or Green algae
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Based on types of pigments
Rich in essential minerals
Polysaccharides
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Food thickeners, cosmetics, agar!
Brown Algae
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Biggest and most complex
Chlorophyll and accessory pigments
Rocky shores
Kelp w/Holdfasts
Red Algae
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Warm coastal waters
Red pigment along with
chlorophyll
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Deepest water (red absorbs
blue and green light)
Depend on water currents to
bring gametes together
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Green Algae
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Unicellular, colonial and multicellular
Green chloroplasts
Marine and fresh (mostly fresh)
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Chlamydomonas
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Single celled
Volvox
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Colonial
Ulva
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Multicellular
Cellulose cell walls, starch for food storage
Asexual and sexual
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Flagellated gametes
17 Origin of Eukarya
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Endosymbiosis– chloroplasts and mitochondria evolved from small
symbiotic prokaryotes that lived within other,
larger host cells.
• Evidence
– present-day mitochondria and chloroplasts are
similar to prokaryotic cells in a number of ways.
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contain DNA, RNA, and ribosomes, which resemble
prokaryotes
mitochondria and chloroplasts copy their own DNA
and reproduce within the host cell by a process
resembling the binary fission of prokaryotes.
Endosymbiosis