Bacteria are microscopic uni-cellular organism. The cells don’t have a membrane-bounded nucleus and they also don’t have other membrane-bounded organelles. Properties of Bacteria
Prokaryotic- no membrane- enclosed nucleus.
They have no mitochondria or chloroplasts.
Have a single chromosome.
1.closed circle that is of double slandered DNA 2.no associatedhistones
If there is flagella they are made of a single filament of the protein that is called flagellin.
Ribosomes differ in structure from eukaryotes.
Have a cell wall made of peptidoglycan.
Bacteria don’t have mitosis.
They mostly use asexual reproduction.
They also don’t have meiosis.
Many bacteria form a spore when their food supply begins to run low, most of the water is removed from the spore and metabolism stops.
Classification ·Shape 1.bacilli- rod shaped 2.cocci- spherical 3.spirilla- curved walls ·ability to create spores ·form of energy production ·nutritial requirement ·reaction to the gram stain
The gram stain- named after the 19th century Danish bacteriologist who developed it.
·The bacterial cells are first tainted with a purple dye called crystal violet. ·The preparation is treated with alcohol or acetone. ·It washes the stain out of Gram- negative cells. ·Bacteria that aren’t decolorized by the alcohol or acetone are Gram-positive. \ Mitochondria and Chloroplasts
There is a lot of evidence that chloroplasts and mitochondria evolved from once free-living bacteria.
Bacteria are microscopic uni-cellular organism. The cells don’t have a membrane-bounded nucleus and they also don’t have other membrane-bounded organelles.
Properties of Bacteria
- Prokaryotic- no membrane- enclosed nucleus.
- They have no mitochondria or chloroplasts.
- Have a single chromosome.
1. closed circle that is of double slandered DNA2. no associated histones
- If there is flagella they are made of a single filament of the protein that is called flagellin.
- Ribosomes differ in structure from eukaryotes.
- Have a cell wall made of peptidoglycan.
- Bacteria don’t have mitosis.
- They mostly use asexual reproduction.
- They also don’t have meiosis.
- Many bacteria form a spore when their food supply begins to run low, most of the water is removed from the spore and metabolism stops.
Classification· Shape
1. bacilli- rod shaped
2. cocci- spherical
3. spirilla- curved walls
· ability to create spores
· form of energy production
· nutritial requirement
· reaction to the gram stain
The gram stain- named after the 19th century Danish bacteriologist who developed it.
· The bacterial cells are first tainted with a purple dye called crystal violet.
· The preparation is treated with alcohol or acetone.
· It washes the stain out of Gram- negative cells.
· Bacteria that aren’t decolorized by the alcohol or acetone are Gram-positive. \
Mitochondria and Chloroplasts
There is a lot of evidence that chloroplasts and mitochondria evolved from once free-living bacteria.
· Alpha- proteobacteria like the rickettsias for mitochondria.
· cyanobacteria for chloroplasts.
Videos
http://www.youtube.com/watch?v=p3jHBOibin8&feature=fvw
http://www.youtube.com/watch?v=41aqxcxsX2w