Card Set Information
Gram positive vs gram negative vs archaea?
: Will stain with crystal violet dye, thick wall made of peptidoglycan
: Will not stain with crystal violet dye, thin wall of peptidoglycan surrounded by additional
Archaea cell walls do not contain peptidoglycan
3 “structures” of bacteria with brief function
: short, spikey “hairs” that provide anchorage
: movement for cell, different than eukaryotic flagella
: Bridge connecting two bacteria for conjugation
Cyanobacteria evolutionary/ecological imp.
: Involved in carbon cycle (photosynthesis) and nitrogen cycle (N-fixation)
: believed to be precursor to chloroplasts in eukaryotes. Major group that changed the earth’s atmosphere.
Cyanobacteria photosynthesis information.
Use chlorophyll a and b + unique accessory pigments called PHYCOBOILINS [phycoerythrin and phycocyanin]
: photosynthetic membrane layers similar to plants
Types of cyanobacteria anatomy with vague description
: collection of bacteria cells that DON’T SEPARATE after binary fission
-hormogonia are broken filaments that may start a new filament strand
: secrete mucilaginious sheath to bind cells together
What’s a stromatolite?
Stacked pattern of Ca2+ rich sediment created by cyanobacteria.
Lime extracted from H2O and secreted around the filaments caused their creation
Describe cyanobacterial blooms
Part of Plankton (basis of food chain), but can explode in # (a bloom / red tide), and can release toxic compounds which affect the food chain.
In cyanobacteria where does N-fixation occur? What is the “endospore-like” cell called?
Heterocysts are specialized cells that carry enzymes for N-fixation. VERY THICK WALL and darker center.
Akinetes are “hibernating” cells that form in response to a harsh env. BIG OVAL CELLS.
2 Given endosymbyotic relationships
Azolla can complex w/ cyanos for N-fixation
Lichens are ½ cyano and ½ fungi