Which of the following statements about nitrogen fixation is true? N_2 is conver

Question

Which of the following statements about nitrogen fixation is true? N_2 is converted to NH_3 at the Fe-Mo site in dinitrogenase 8 ATP is needed to fix one N_2 ATP hydrolysis in dinitrogenase provides energy for N_2 fixation Electrons pass from Fe-Mo to Fe^4S_4 clusters and finally are accepted by N_2 in dinitrogenase reductase Formation of H_2 is catalyzed by dinitrogenase reductase Which of the following statements about biosynthesis of valine, isoleucine and leucine is not true? They are synthesized from pyruvate. The three amino acids share the first step, in which TPP is required and one CO_2 is released. Valine pathway branches from leucine pathway at the second step. The final step is a transamination reaction with glutamate for all the three amino acids. Valine and leucine comes from condensation of two pyruvates. Which of the following amino acids has highest concentration in normal blood? Glutamine Glutamate Proline Aspartate Lysine Aspartate is synthesized from alpha-ketoglutarate 3-phosphoglycerate Pynivate Oxaloacetate Ribose-5-phosphate

Explanation / Answer

42. N2 is converted to NH3 in dinitrogenase.

ATP hydrolysis in dinitrogenase provides energy for N2 fixation.

44. Glutamine

45. Pyruvate and oxaloacetate

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