Flashcards
Microbiology IV
Flashcards do conjunto (16)
- 1Name an example of a microenvironmentSoil particle
- 2How do ou measure [O2] within a soil particle?Using microelectrodes
Oxygen levels will change within short distances
Anerobic thrive near centre
Aerobic on periphery - 3What's the difference between mineral soil and organic soil?Mineral soil - forms from rock weathering and inorganic material
Organic soil - form from sedimentation in bogs and marshes - 4Where is microbial growth highly promoted in soil?In the rhizosphere - roots exude nutrients which microbes can absorb
- 5How is growth in soil visualised?Fluorescent microscopy
SEM - 6What is the subsurface?Groundwater
Microbes survive on poor nutrient diet
Probs use H2 as electron donor for resp. - 7What microbes exist in fresh water?Oxygenic phototrophs
Algae+Cyanobacteria
1' producers, E comes from light - 8What are the names for different microbes living at different depths of freshwater bodies?Planktonic - floating
Benthic - attached to bottom/side of lakes/streams - 9What are the names of the different layersEpillimnion
Thermocline
Hypolimnion - 10What are conditions like in coastal/ocean waters?Very low in nutrients, especially N,P,Fe.
Water temperatures more constant and cooler - 11What is characteristic of microbes in the ocean?Very small cells, characteristic of poor-nutrient environments
Less energy to maintain cell
Requires a greater number of transport enzymes relative to cell volume to gain nutrients from a very dilute environment - 12How are these microbes important for global CO2 levels?Their oxygenic photosynthesis is a major contributor
- 13At what levels of the ocean do bacteria occur?In the photic zone - where light can penetrate
Deep sea is below 1000m, there's low C, nutrients, and high pressure - 14Name some abiotic growth factorsNutrient availability
C
pH
Moisture
O2 - 15What sort of organisms tolerate O2's presence?Aerotolerant, they tolerate O2 but don't use it in their metabolism.
- 16Define water activityRatio of vapour pressure of air in equilibrium with a substance or solution to the vapour pressure of pure water.
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- O usuário eliminou as informações de disciplina FlashCards sobre Microbiology IV, criado por Usuário eliminado em 22-01-2018.
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- Criado por J yadonknow · 21 jan 2018
- Copiado por J yadonknow · 22 jan 2018
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