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Chapter 20: Q-24-42P (page 1038)

Metabolism of arginine produces urea and the rare amino acid ornithine. Ornithine has an isoelectric point close to 10. Propose a structure for ornithine.

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Arginine Ornithine Urea

Step by step solution

01

Step-1. High isoelectric point of ornithine:

The high isoelectric point of ornithine indicates that, it must be having a strongly basic side chain as present in lysine. The N-CH2bond that is present in the side chain of arginine remains intact during its metabolism.

02

Step-2. Products from metabolism of arginine:

Metabolism of arginine produces ornithine and urea. Arginine acts as a precursor in ornithine biosynthesis. Enzyme arginase catalyses the formation of arginine to ornithine. Arginine also plays crucial role in urea cycle.

Arginine Ornithine Urea

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Most popular questions from this chapter

Show how Fischer esterification might be used to form the following esters. In each case, suggest a method for driving the reaction to completion.

(a) methyl salicylate

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Question:

  1. Determine the structure of the carboxylic acid whose proton NMR spectrum appears below.
  2. Draw the NMR spectrum you would expect from the corresponding aldehyde whose oxidation gives this carboxylic acid.
  3. Point out two distinctive differences in the spectra of the aldehyde and the acid.

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