Flashcards in Bacteria Deck (51)
Prokaryotic cells do not have what?
What are the 3 bacterial shapes?
Rod shaped (bacilli
What are the three spherical categories?
diplococcus (cells grouped in 2)
streptococcus (long chains)
staphylococcus (grape clusters)
What are the 2 spiral categories?
Rigid helix (spirillum)
Flexible helix (spirochete)
bacteria cell walls are composed of what?
Some bacteria have a _____ surrounding the cell wall.
Describe gram-positive bacteria:
absorb and retain crystal violet stain
walls very thick
consist mainly of peptidoglycan
Describe gram-negative bacteria:
don't retain a stain when rinsed with alcohol
wals have a thin peptidoglycan layer
have a outer membrane
Most prokaryotes have a capsule or___
The outer covering of some prokaryotes may protect the cell against what?
Bacteria also use____to attach to surfaces such as rocks and teeth.
protein structures extending from cell
help bacteria adhere to one another or other surfaces
Prokaryotes move by means of a ____.
List the 3 parts of bacteria flagella:
Flagellum act like a_____
Prokaryote Genes consist of:
1 circular DNA molecule in nuclear area
1 or more plasmids (circular DNA fragments)
What happens in binary fission?
cell divides, forming 2 cells
What is the most common form of reproduction in bacteria?
Under ideal conditions, a bacterium may divide every ______.
bud forms, separates from mother cell
walls form inside cell and then separates into several cells
bacterial cell takes in DNA fragments released by a dead bacterium and than incorporates its DNA into its
phage carries bacterial DNA from one bacterial cell into another
two cells of different mating types exchange genetic mateerial
extremely durable cells that remain dormant
Archae do not form____
What type of environments do endospores form in?
very dry, hot
Some bacterial endospores are disease causing, such as
Bacillus anthracius (anthrax)
Clostridium tetani (tetanus)
dense films formed by bacteria living in watery enviroments