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    				| 1. | Which enzyme is necessary for bilogical fixation of nitrogen in plants? Mention its two sub units? | 
| Answer» Nitrogenase enzyme. Its two sub-unit are (i) a non-heme iron protein commonly called Fe protein (or dinitrogen reductase) and (ii) an iron molybdenum protein called MoFe-protein (or dinitrogenas). Both these sub-units are needed for the activity of enzyme. | |