Prokaytoic Algae Flashcards
Domain of prokaryotes
Eubacteria
Phylum Cyanobacteria contains ____, _____ or ______ forms
Unicellular, filamentous, colonial
Where does photosynthesis take place in Cyanobacteria
Photosynthetic apparatus is not bound to chloroplasts, but rather on the surface of thylakoid membranes.
Do Cyanobacteria have nucleus?
No definite nucleus, although the single chromosome is generally confined to a central area.
Cell wall of Cyanobacteria is usually enclosed in a ____
Mucilage sheath
Order Chroococcales
Artificial group of single-celled or colonial Cyanobacteria that reproduce solely by fission. Cell shape ranges from spherical to oval or cylindrical.
Most genera form regular or irregular aggregates of cells that are imbedded in mucilage. The order is subdivided based on planes or division of cells
Family Microcystaceae and Merismopediaceae above groups
Phylum Cyanobacteria
Order Chroococcales
Gloeocapsa sp. division
Family Microcystaceae
The cells fail to separate on division, resulting in a small colony. Each cell within the colony secretes one or more mucilage layers, resulting in a layered sheath.
Merismopedia sp. division
Family Merismopediaceae
This genus has 2 cells that form 2-dimensional colonies as a result of cell division in two planes
Microcystis sp. arrangement
Family Microcystaceae
One of the common genera of colonial Cyanobacteria in Manitoba, these organisms grow as spherical or irregular colonies of small, densely packed with black gas vesicles
Order Oscullatoriales
Filamentous Cyanobacteria without specialized cells
Oscillatoria sp.
Family Oscullatoriaeae
Solitary filaments in which there is often a slight tapering in each filament. Mucilage sheaths are very thin and cells are wider than long.
Oscillatoria reproduction
Reproduction is by fragmentation which occurs in a region of dead cells (necridia) to give filament fragments called “hormogonia pl, or homogone)
Fragmentation is followed by cell division to return the filament to near original length
Lyngbya sp. design
Order Oscillatoriales
Family Oscillatoriaceae
Similar to Oscillatoria so, but have definite sheaths that extend beyond the cells of the filaments
Order Nostocales design
-multicellular, filamentous Cyanobacteria with different cell types (vegetative cells, heterocysts, akinetes)
-filaments show isopolar growth (from both ends) and the cells are spherical, barrel-shaped or cylindrical.
-filaments unbranched and constant diameter (not tapered)
-contain heterocysts, that fixate nitrogen.
