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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.

Short Answer

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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

(b) methyl formate (32°C)

(c) ethyl phenylacetate

Question: Show the products you expect when each compound reacts with NBS with light shining on the reaction.

c)

Grignard reagents add to carbonate esters as they add to other esters.

(a) Predict the major product of the following reaction.

(b) Show how you would synthesize 3-ethylpentan-3-ol using diethyl carbonate and ethyl bromide as your only organic reagents.

(c) Diethyl carbonate is a liquid reagent that is easy to handle. In contrast, phosgene is a highly toxic and corrosive gas. Show how you might use diethyl carbonate instead of phosgene to make Lexan®. Also, show how you might use diethyl carbonate instead of methyl isocyanate to make Sevin® insecticide.

Show how you would synthesize any of the standard amino acids from each starting material. You may use any necessary reagents.

(a) Propose a mechanism for the following reaction:

(b) Use the bond-dissociation enthalpies given in Table 4-2 (page 203) to calculate the value of ∆H° for each step shown in your mechanism. (The BDE for is about 280 kJ/mol, or 67 kcal/mol.) Calculate the overall value of ∆H° for the reaction. Are these values consistent with a rapid free-radical chain reaction?
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