What is the common name for the members of class prochlorobacteriae?
Members of class Prochlorobacteriae contain which pigments?
chlorophyll a/b, carotenoids (accessory)
Members of which class are commonly found in sea squirts (tunicates) and water depths up to 100m
What type of bacteria may support the idea that chloroplasts may have arisen from symbiotic prokaryotes?
Describe the Endosymbiotic Theory
A primitive eukaryotic cell, called a proto-eukaryote, lived in close association with a prokaryote. Eventually, the two cells became so dependent on each other that they could not live apart and the modern eukaryote cell came into being. The prokaryotic cells became mitochondria and chloroplasts in the new eukaryotic cell.
What is a weakness of the Endosymbiotic Theory?
It cannot explain the origin of flagella by this same mechanism. The flagella of eukaryotes move back and forth while the flagella of prokayotes spin like a propeller. The flagella operate by two completely different mechanisms.
Describe the six pieces of evidence that support the Endosymbiotic theory.
1. M and C physically resemble prokaryotes (size, membrane structure)
2. double membrane in M and C
3. different lipid composition in outer & inner membrane. (outer - proto-eukaryote, inner - prokaryotic)
4. M and C have their own DNA (slightly different, replicate independently of nucleus)
5. C contain the same pigments as Prochloron
6. Symbiotic relationships between prokaryotic cells and other cell types are possible
What are two examples of symbiotic relationships between a prokaryotic cell and a different cell type?
prochloron lives inside tunicate, cyanobacterium lives inside a diatom
Define "alteration of generations"
During the life cycle, there is an alternation between a diploid sporophyte phase and a haploid gametophyte phase
Which generation / phase is the dominant, visible part of the life cycle of many "primitive" forms?
Which generation / phase is the dominant, visible part of the life cycle of many "complex" forms? The other is greatly reduced / microscopic
What are the five phyla we studied in kingdom Protista?
Chlorophyta, Chromophyta, Rhodophyta, Euglenophyta, Dinophyta
Describe the general morphology of kingdom Protista
Eukaryotic, do not have complex tissues, very diverse and heterogenous group
Describe the general reproduction of kingdom Protista
asexual and sexual, many exhibit alternation of generations
Members of which phylum are commonly found in freshwater (majority), salt water, terrestrial, fur of animals (sloths, polar bears), in flatworms, and in association with lichens?
g. Chlamydomonas and Desmids are members of p. Chlorophyta that have a ________ morphology
g. Ulothrix and g. Spirogyra are members of p. Chlorophyta that have a ________ morphology
Describe the motility of the members of p. Chlorophyta
some unicellular forms use flagella, multicellular forms often have flagellated gametes
Describe the Ecological and Economic Significance of p. Chlorophyta
Important primary producers, Chlorella is being tested as a recycling organism, sold in health food stores
Describe the structure and function of the statospore
The statospore has a silicified wall and a plug that form a protective shell around the zoospore. It is formed when conditions are unfavorable, It is a resistant resting stage
What is the best known and commercially important group in phylum Chromophyta?
Describe the morphology of the members of class Bacillariophyceae
clear shell has two halves (valves) and is composed of pectin (organic) and aluminum silicate (glass). The shells have fine grooves and pores which connect the protoplasm to the outside of the shell. They contain one to many chloroplasts.
Describe the motility of the members of class Bacillariophyceae.
The diatoms "crawl" on the substrate by attaching tiny fibrils to a surface and contracting them
Describe the economic significance of class Bacillariophyceae
Diatomaceous earth consists of diatom shells and is used for high melting point materials, filtration, mild abrasives (metal polishes, toothpaste), and light reflecting paint (license plates, highway markers)
Members of which class are commonly found in cold ocean waters (very few occur in freshwater) up to 30m / 100ft deep
Define "compensation point"
the depth in the water column at which a photosynthetic organism can receive just enough light to maintain itself. There is no growth or reproduction.
What is an example of a brown algae member of class Phaeophyceae?
Sargassum (Sargasso Sea, just off the east coast)
Describe the morphology of c. Phaeophyceae
multicellular, relatively large. Many have a body differentiated into holdfast (roots), stipe (stalk), blades, bladders (10% CO filled float)
Describe the motility of c. Phaeophyceae
nonmotile adult forms; reproductive cells have two lateral flagella