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Cell biology
Biological molecules
Organisation
Infection and response
Energy transfers (a2 only)
Homeostasis and response
Responding to change (a2 only)
The control of gene expression (a-level only)
Substance exchange
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
Ecology
Cells
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1c the tudors: england, 1485-1603
1l the quest for political stability: germany, 1871-1991
Inter-war germany
1f industrialisation and the people: britain, c1783-1885
Britain & the wider world: 1745 -1901
2n revolution and dictatorship: russia, 1917-1953
2j america: a nation divided, c1845-1877
The cold war
World war two & the holocaust
World war one
Medieval period: 1066 -1509
The fight for female suffrage
2m wars and welfare: britain in transition, 1906-1957
2d religious conflict and the church in england, c1529-c1570
Britain: 1509 -1745
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09/01/2023
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The Nitragen Cycle (NFAND) 1) Nitrogen Fixation - Atmostspheric Nitrogen (N₂) converted into Ammonia (NH3) by fixing bacteria in the soil. Bacteria in habit root nodules provide source of ammoniations for plants. 2) Ammonification - when an organisum dies or produces was te, it is decomposed by saprob -ionts using extracellular digestion. Releases the nutrients. Ammonification is a by product of S- aprobiont nutrion. 3) Nitrofication - Ammonium ions that were rele-- ased from (2) are converted into nitrates by bacteria in soil. Nitrifying bacteria firstly conver + NH4+ ions to nitrites, another nitrites into nitrates. 11 then convert -The Nitrogen Cycle --4) Denitrification - Denitrifying bacteria conv evt nitrates in the soil back in to atmospheric nitrogen (N₂). This is anaerobic (water clogged) N₂ Nitrogen Fixation 1 → Harber Process Denitrification narobic bacteric Nitrate nitrogen fit bacteria XX Death saprobiotic microorganisums. nitrobacteria ↓ Ammonia (NH3) Ammonification 2 Nitrite nitrification 3.
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