Nov 04, 2015 · The gas-phase tautomerization reaction between I and II adopted a 1,2-proton shift mechanism, involving two transition states, with activation energies between 47.67 and 52.69 kcal/mol and an sp 3-type intermediate. These data indicate that the interconversion between I and II, in the gas-phase, could only take place under severe thermal conditions. This is the continuation of the article “Carbohydrates MCQ Online Examination- Part 1” Welcome to Biochemistry MCQ (Multiple Choice Questions) examinations zone. These questions are designed based on the Topic “Carbohydrates”.
The ability to degrade the amino acid histidine to ammonia, glutamate, and a one-carbon compound (formate or formamide) is a property that is widely distributed among bacteria. The four or five enzymatic steps of the pathway are highly conserved, and the chemistry of the reactions displays several unusual features, including the rearrangement of a portion of the histidase polypeptide chain to ... A tautomer is basically a different type isomer by an organic compound that has the characteristic that it can rapidly change their isomeric form by the simple chemical reaction, that process called tautomerization. Typically, this happens as the transfer of hydrogen atoms (protons) by an interchange of one single bond with a double bond.
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