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22 Cards in this Set

  • Front
  • Back
What is a virus
strands of nuleic acid encased in a protein coat
why are virus's not living?
don't reproduce, don't grow and develop, are not one or more cell
are bacteria prokaryotic or eukaryotic
do prokaryotic cells have a nucleus?
name 2 bacteria kingdoms.
Archaebacteria and Eubacteria
what are 3 types of archaebacteria?
1. Methanogens
2. Extremophiles
3. Non-extreme
What is a methanogen?
and anaerobe, live in swamps, marshes, and intestines, produce methane gas
what are extremophiles and name 3 types of them.
extreme condition bacteria
1Thermophiles: live in extreme hots or colds
2Halophiles: live in extreme salty areas
3Pressure and pH tolerant: live in high or low pH and at 300-800 ATM
what are non-extremes?
able to grow in same environment as eubacteria.
eu is greek for?
archaebacteria differs from eubacteria how?
archaebacteria have no peptidoglycan in there cell wall. eubacteria do
the largest group of bacteria is?
what do saprobes do?
live on dead/dying material
what are cyanobacteria?
blue green bacteria, photosynthetic, 1st to recolonize site devoid of life
what is lichen?
a symbiotic relationship between a fungi and a cyanobacteria
what are 3 shapes of bacteria?
Bacilli, Cocci, Spirilla
what does bacilli look like? cocci, spirilla?
Bacilli: rod shape
Cocci: spherical
Spirilla: spirals
what does diplo, strepto, and staphlylo mean?
diplo: pair
strepto: chain
staphlylo: cluster
3 ways for bacteria to reproduce?
binary fission, conjugation, spore formation
explain binary fission
when bacterium has grown to double its size, it replicates dna and divides in half.

most common way, asexual
explain conjugation
a protein 'bridge' forms between 2 bacteria. 1 (donor) contributes part of genetic info to other (receiver)

less common, sexual
explain spore formation
when conditions are unfavorable
endospore is formed when bacterium produces think internal wall enclosing its DNA and some cytoplasm. remain dormant for months or years until conditions improve.

not reproduction, survival