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Nitrogen Fixation and Photosynthesis

Nitrogen Fixation and Photosynthesis
The chief source of nitrogen for green plants is

atmospheric nitrogen
low molecular weight- organic nitrogenous compound
nitrates
ammonium salts

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Nitrogen Fixation and Photosynthesis
What is the metal ligand in chlorophylls?

Iron (Fe)
Magnesium (Mg)
Copper (Cu)
Manganese (Mn)

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Nitrogen Fixation and Photosynthesis
During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately

25 ATP
7 ATP
12 ATP
18 ATP

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Nitrogen Fixation and Photosynthesis
In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?

Erythrose-4-phosphate
Ribulose-l,5-diphosphate
Ribose-5-phosphate
Alpha-ketoglutarate

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Nitrogen Fixation and Photosynthesis
Chlorophyll is associated with

matrix
stroma
thylakoids
cristae

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Nitrogen Fixation and Photosynthesis
An organism that relies exclusively on pre-synthesized food molecules is

prokaryotic
autotrophic
heterotrophic
photosynthetic

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