Micro Exam 3d Flashcards
(11 cards)
1
Q
microbes live in variety of habitats because of abilities to….
A
- use a variety of carbon and energy sources
- grow under different physical conditions
2
Q
mycorrhizae
A
contribute to plant growth
- endo: form vesicles
- ecto: form mycelial mantle over small roots of trees
- fungi living in close association with plant roots
- expand surface areas
3
Q
detritus
A
non-living particulate organic matter
4
Q
carbon fixation
A
any process in which gaseous carbon dioxide is converted into solid organic compound
5
Q
carbon cycle
A
return of CO2 to atmosphere by respiration closely balances removal by fixation
- burning of fossil fuels adds more CO2 resulting in steady increase
6
Q
nitrogen cycle
A
molecular nitrogen (N2) makes up almost 80% - for plant uses nitrogen must be fixed, taken up and combined into organic compounds
7
Q
types of nitrogen fixation
A
- ammonification
- fixation
- nitrification
- denitrification
8
Q
ammonification
A
- proteins and waste products to amino acids
- amino acids to ammonia
- ammonia and H2O to ammonium and hydroxide ion
9
Q
nitrification
A
- ammonium ion to nitrite ion
- nitrite ion to nitrate ion
10
Q
denitrification
A
nitrate ion to N2 gas
11
Q
nitrogen fixation
A
N2 gas to ammonia
