Describe the mechanism of the nitrogenase complex in which N2 is converted to NH3.

Rice plants that have been engineered to overexpress alanine aminotransferase need about two-thirds less fertilizer than control plants. What does this information reveal about the process of nitrogen assimilation?

Explain the role that Gla residues play in complexes.  Explain the role of vitamin K / warfarins in the synthesis of protease factors and list the Vitamin K-dependent factors

Does Mannitol form a bit in the presence of H2O2?

Why Phenylmethylsulfonyl fluoride (PMSF, shown in Fig.) does not inhibit aspartate protease as potent as serine protease?

Complete the paragraph describing the fate of glutamate, labeled at the Cγ position with 14C, once it has been introduced to the TCA cycle.   In the second round (A.) 50%,B.) 25%, C.)or NONE of the label is lost) , however, in each subsequent cycle (25%,50%, or NONE of the label is lost). This occurs becuase at the end of the second round the label is (A.)Equally dsitributed among all carbons B.) part of the carboxylate group C.) Positioned on the erminal Carbon)  of oxaloacetate and each cycle (A.) releases a carbon B.) Releases two carbons C.) adds a carbon)  from oxaloacetate.

The formation of “hard” clots by factor XIIIa involves linking lysine and glutamine side chain residues in fibrin. Draw a representation of the cross-linked product of a reaction between these two amino acids.

How would you treat an infant who is deficient in argininosuccinate synthetase? Which molecules would carry nitrogen out of the body?

Can you explain the regulation of PFK-1 by ATP and AMP?