Chapter 23 Flashcards
Fossilized forms of microscopic life
-resemble present-day prokaryotes
Microfossils
What two groups are prokaryotic?
Archaea and Bacteria
Prokaryotes are single-celled and have individuality but can adhere to each other
Unicellularity
These are more resistant to environmental stressors than is a simple colony of a single type of microbe
-most bacteria are capable of forming a complex community of different species
Biofilm
Two types of bacteria can be identified using a staining process
Gram stain
Bacteria that have a thicker peptidoglycan wall and stain the color purple
Gram positive
Bacteria that contains less peptidoglycan and do not retain the purple colored dye
Gram negative
Prokaryotes have slender rigid helical flagella composed of the protein called what
Flagellin
Other hairlike structures that occur on the cells of some of Gram negative prokaryotes
Pili
A thick wall around the genome and a small portion of their cytoplasm when they are exposed to environmental stress.
Endospores
Invaginated regions of the plasma membrane that function in respiration and photosynthesis
Internal membranes
Region of the cell known as the area within a single double stranded ring of DNA that is highly condensed to form a visible region
Nucleoid region
Best known transmissible plasmid and fertility factor
F plasmid
conjunctive plasmids pick up antibiotic resistance genes becoming resistance plasmids
R plasmids
Uses chlorophyll a as a key-light capturing pigment and H2O as an electron donor, releasing oxygen gas as a by-product
Cyanobacteria
