Terms in this set (15)
For proteins, DNA
Why is nitrogen needed by living things?
Similar to why carbon is needed.
Where do living things get nitrogen from?
Nitrogen gas makes up what percentage of our atmosphere?
Life on Earth relies on __________ to turn unusable N2 into a form that is usable to the plants, and ultimately to animals.
Ammonia, Nitrates, Nitrites
Usable forms of nitrogen
Form of nitrogen plentiful in atmosphere but not usable to most living things
Process by which nitrogen gas is changed into a form that can be used by living things (they change it to ammonia at first).
Convert ammonia to nitrates
Nitrates can also be taken up and used by plants (like ammonia).
Some bacteria convert ammonia to nitrites, which cannot be used by plants or animals.
Convert nitrites back to N2
Return N2 to the atmosphere.
Denitrifying, Nitrifying, N-fixing
Three types of bacteria involved in the nitrogen cycle.
Lightning and Nitrogen fixation
In what ways is Nitrogen gas removed from the atmosphere?
By what process are animal wastes and dead organisms converted to other nitrogen-containing compounds?
Nitrates in soil
What is the only form of nitrogen that nonlegume plants can take in and use?
Return N2 to the air
What do the denitrifying bacteria do during the denitrifying process?
NH3 would increase in soil
If the number of nitrifying bacteria decreased, what effect would this have on the nitrogen cycle and what type of compounds would accumulate as a result?
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