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L39 Microbial growth and behaviour (Winogradsky column)

Mer Scott 12 Fragen Aktualisiert am 5 Jun 2017

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  1. 1Choose the incorrect statement about trophic nourishment.
    1. AChemoheterotrophs can get their energy and carbon from the same organic compound.
    2. BA phototroph uses light as en energy source, and can be oxygenic or anoxygenic.
    3. CA chemotroph uses chemical energy as an energy source.
    4. DAutotrophs can make complex carbons from CO2.
    5. EAnoxygenic phototrophs oxidise molecules like H2S and do not produce oxygen.
    6. FOxygenic phototrophs reduce H2O and produce oxygen.
  2. 2Choose the correct statements about cyanobacteria.
    1. AThey use light as an energy source.
    2. BThey oxidise water for electrons.
    3. CThey use complex carbons for a carbon source.
    4. DThey carry out oxygenic photosynthesis.
    5. EThey reduce water for electrons.
  3. 3Choose the incorrect statement about green and purple cyanobacteria.
    1. AThey are photoautotrophs.
    2. BThey oxidise H2S to S for an electron source.
    3. CThey use CO2 for an energy source.
  4. 4Choose the correct statement about colourless sulfur bacteria(Beggiatoa).
    1. AThey sit below green and purple sulfur bacteria in the Winogradsky column.
    2. BThey are chemoheterotrophs.
    3. CThey oxidise H2S to SO4.
    4. DThey use complex organic carbons for a carbon source.
  5. 5Sulfate reducing bacteria are chemoheterotrophs that essentially reverse the processes that colourless sulfur bacteria carry out.
    1. ARichtig
    2. BFalsch
  6. 6Organisms which carry out fermentation are [blank_start]chemoheterotrophs[blank_end]. Their energy source, carbon source, and electron donor, are always [blank_start]complex carbons[blank_end] (organic molecules) and sometimes are even the same molecule. An example of [blank_start]a fermenting chemoheterotroph[blank_end] are cellulose degrading bacteria, which break pyruvate down into [blank_start]acetate[blank_end] and simultaneously degrade cellulose into [blank_start]lactate[blank_end]. Other examples include clostridium and [blank_start]rumen[blank_end] bacteria.
    1. Achemoheterotrophs
    2. Bchemoautotrophs
    3. Ccomplex carbons
    4. Dfermenting chemoheterotrophs
    5. Efermenting chemoautotrophs
    6. Facetate
    7. Gacetic acid
    8. Hlactate
    9. Ilactose
    10. Jrumen
    11. Kcolourless sulfur
  7. 7Microbial growth in a [blank_start]closed batch[blank_end] culture system is not like nature, in that it is a 'Feast and [blank_start]Famine[blank_end]' situation controlled by the examiner. There are four stages which characterise the growth [blank_start]curve[blank_end] for bacteria in this system.
    Firstly, there is a [blank_start]lag phase[blank_end]. It is shown as little to no change in the population size. The lag period [blank_start]differs depending[blank_end] on how much the inoculum must evolve and adjust before it is suited to the environment/has the proper [blank_start]biosynthetic reactions[blank_end] taking place.
    The next phase is the [blank_start]exponential phase[blank_end]. During this phase there are [blank_start]no limited resources[blank_end] or competition and so the bacterial population can [blank_start]double[blank_end] in size every generation via binary fission, displaying exponential population growth.
    The next phase is the [blank_start]stationary phase[blank_end]. This appears to be a stable population size, but does not indicate static activity. Instead, it reflects the cryptic growth of the organisms. Cryptic growth is the state of [blank_start]dynamic[blank_end] equilibrium where organisms survive by feeding from the lysed, dead bodies of deceased organisms.
    Finally, there will be a [blank_start]death phase[blank_end] where the population size decreases until it is at a stable end point.
    1. Aclosed batch
    2. Bopen batch
    3. CFamine
    4. Dcurve
    5. Elag phase
    6. Fexponential phase
    7. Gstationary phase
    8. Hdeath phase
    9. Idepends
    10. Jbiosynthetic reactions
    11. Kdouble
    12. Lno limited resources
    13. Mlimited resources
    14. Ndynamic
  8. 8What might cause a persistent bacterial infection?
    1. AMicrobes which are able to degrade antibiotics.
    2. BMicrobes not all being in the same stage of a life cycle, and the non-dividing organisms not being targeted by antibiotics.
    3. CMicrobes which can repopulate faster than a patient can be medicated.
  9. 9To be antibiotic resistant a microbe must carry the genes which confer resistance.
    1. ARichtig
    2. BFalsch
  10. 10Choose the incorrect statement about microbial behaviour.
    1. ASome bacteria are very large e.g. thiomargarita.
    2. BSome bacteria have organelles e.g. Anammox bacteria
    3. CMyxobacteria display social behaviour.
    4. DNone of these are incorrect.

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Beschreibung
1.Describe the different energy and carbon sources used by microorganisms. 2.Describe the growth characteristics of prokaryotes in a ‘closed’ batch culture system. 3.Outline some examples of microbial behaviour.
Sprache
English
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133
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Erstellt am 5 Jun 2017 · aktualisiert am 5 Jun 2017
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