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Ch.19 Algae and the Origin of Eukaryotic Cells (Green Algae (Body…
Ch.19 Algae and the Origin of Eukaryotic Cells
Concepts
endosymbiosis
one organism lives inside another and both benefit
protozoans and algae
living descendants of clades originated from early eukaryotes
embryophytes
green algae that produced true plants
Origin of Eukaryotic Cells
DNA Structure
"naked"
not complex
Nuclear Structure and Division
no nucleus
DNA in cytoplasm
Organelles
ribosomes and storage granules
flagella cilia
Origin of Mitochondria and Plastids: The Endosymbiont Theory
autogenous theory
prokaryotes to eukaryotes
endosymbiont theory
plastids and mitochondria dicovered to have their own DNA
Characteristics of Various Groups of Algae
first green algae
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then red algae
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finally attention to secondary endosymbiosis of plastids
Green Algae
Body Construction in Green Algae
Motile Colonies
Nonmotile Colonies
filamentous body
membranous body
parenchymatous body
Coenecytic body
Life Cycles of Green Algae
dibiontic
monobiontic
sexual reproduction
first were isogamous
later became anisogamt and oogamy
gametangia and sporangia
Representative Genera of Green Algae
Unicellular Species
Motile Colonial Species
Filamentous Species
zoospores
conjugation
Laminar Species
Coenocytic Species
Parenchymatous Species
charophytes
Green Algae and Embryophytes
strreptophytes
archaeplastids
primoplantae
Euglenoids
majority never have chloroplats
derived through secondary emdosymbiosis
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Brown Algae and Their Relatives: The Heterokonts
Brown Algae
littoral zone
laminarin
receptacles
conceptacles
trumpet cells
Diatoms
diatomaceous earth
sunken siliceous frustules at ocen floor
Yellow-Green Algae
occurs mostly in fresh water
Golden-Brown Algae
coccolithophorids
inert and do not decompose
Dinoflagellates
Oomycetes
no chloroplasts
parasitic or saprophytic
unusual characters
Red Algae
floridean starch
branched polymer of glucose
agar
culture medium
(used in microbiology)
pit connections
new wall formed as a ring and grows inward from original cell wall
more info
more info
what's emdosymbiosis again?
