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Nitrogen Cycle Practice
Explain why living things need nitrogen.
To make protein
Enzymes
Antibodies
Muscle
Explain why nitrogen atoms are able to cycle.
Atoms are not created or destroyed during chemical reactions
Only bonds change
Re-arranged
N N N N N
The nitrogen cycle is driven by chemical reactions performed
by bacteria .
Identify the nitrogen-containing molecule below.
Ammonia (NH3)
State the location of this molecule in nature.
Soil
Identify the nitrogen-containing molecule below.
Protein
State the location of this molecule in nature.
Living things (plants and animals)
Identify the nitrogen-containing molecule below.
Nitrogen gas (N2)
State the location of this molecule in nature.
Atmosphere/air
Explain why living things cannot use N2 gas directly to make
protein.
Triple bond
During the nitrogen cycle, N2 gas must be transformed into
NH3 .
This chemical reaction is called nitrogen fixation .
Explain what it means to say that the N2 is “fixed.”
Made useable
The ONLY type of organism that can fix nitrogen are
bacteria that live in the soil .
Nitrogen-fixing
bacteria
Explain how nitrogen-fixing bacteria are able to split N2.
Enzyme
Lowers the A.E.
H
H N
H
H
N H
H
Nitrogen fixation moves nitrogen from the atmosphere to
the soil
.
Identify the process below.
Denitrification
State which type of organism performs this reaction.
A second type of soil bacteria
Denitrification moves nitrogen from the soil
atmosphere .
back to the
Label the bio and geo parts of the carbon cycle.
Which chemical reaction removes nitrogen from the soil?
Denitrification
Other that denitrification, how else is nitrogen removed from
the soil?
Which two processes add nitrogen to the soil?
#25 in SG
Nitrogen
fixation
How is nitrogen passed from autotrophs to heterotrophs?
Eating