11954918
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
almost 7 years ago
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| Question | Answer |
| Name an example of a microenvironment | Soil particle |
| Microbial growth on soil particle | Anerobic thrive near centre Aerobic on periphery |
| Where is microbial growth highly promoted in soil? | In the rhizosphere - roots exude nutrients which microbes can absorb |
| How is growth in soil visualised? | Fluorescent microscopy SEM |
| What is the subsurface? | Groundwater Microbes survive on poor nutrient diet Probs use H2 as electron donor for resp. |
| What microbes exist in fresh water? | Oxygenic phototrophs Algae+Cyanobacteria 1' producers, E comes from light. |
| What are the names for different microbes living at different depths of freshwater bodies? | Planktonic - floating Benthic - attached to bottom/side of lakes/streams |
| What are the names of the different layers | Epillimnion Thermocline Hypolimnion |
| What are conditions like in coastal/ocean waters? | Very low in nutrients, especially N,P,Fe. Water temperatures more constant and cooler |
| What 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 |
| How are these microbes important for global CO2 levels? | Their oxygenic photosynthesis is a major contributor |
| At 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 |
| Name some abiotic growth factors | Nutrient availability C pH Moisture O2 |
| What sort of organisms tolerate O2's presence? | Aerotolerant, they tolerate O2 but don't use it in their metabolism. |
| Define water activity | Ratio of vapour pressure of air in equilibrium with a substance or solution to the vapour pressure of pure water. |
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