Micro Exam 3d Flashcards Preview

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Flashcards in Micro Exam 3d Deck (11)
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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