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22 Cards in this Set
- Front
- Back
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What is a virus
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strands of nuleic acid encased in a protein coat
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why are virus's not living?
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don't reproduce, don't grow and develop, are not one or more cell
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are bacteria prokaryotic or eukaryotic
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prokaryotic
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do prokaryotic cells have a nucleus?
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no
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name 2 bacteria kingdoms.
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Archaebacteria and Eubacteria
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what are 3 types of archaebacteria?
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1. Methanogens
2. Extremophiles 3. Non-extreme |
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What is a methanogen?
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and anaerobe, live in swamps, marshes, and intestines, produce methane gas
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what are extremophiles and name 3 types of them.
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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 |
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what are non-extremes?
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able to grow in same environment as eubacteria.
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eu is greek for?
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true
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archaebacteria differs from eubacteria how?
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archaebacteria have no peptidoglycan in there cell wall. eubacteria do
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the largest group of bacteria is?
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eubacteria
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what do saprobes do?
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live on dead/dying material
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what are cyanobacteria?
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blue green bacteria, photosynthetic, 1st to recolonize site devoid of life
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what is lichen?
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a symbiotic relationship between a fungi and a cyanobacteria
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what are 3 shapes of bacteria?
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Bacilli, Cocci, Spirilla
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what does bacilli look like? cocci, spirilla?
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Bacilli: rod shape
Cocci: spherical Spirilla: spirals |
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what does diplo, strepto, and staphlylo mean?
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diplo: pair
strepto: chain staphlylo: cluster |
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3 ways for bacteria to reproduce?
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binary fission, conjugation, spore formation
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explain binary fission
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when bacterium has grown to double its size, it replicates dna and divides in half.
most common way, asexual |
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explain conjugation
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a protein 'bridge' forms between 2 bacteria. 1 (donor) contributes part of genetic info to other (receiver)
less common, sexual |
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explain spore formation
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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 |
