
Concept explainers
(a)
Interpretation: To determine whether ornithine is associated with (1) transamination, (2) oxidative deamination, or (3) the urea cycle.
Concept introduction: Transamination reaction is a biochemical reaction that involves the transfer of an amino group. In transamination reaction exchange of an amino group from an
A biochemical reaction in which an
A urea cycle is a cyclic biochemical pathway that involves the production of urea using ammonium ions and aspartate molecules as nitrogen sources. The reactants in the formation of carbamoyl phosphate are ammonium ion, water, and carbon dioxide.
(a)

Answer to Problem 15.74EP
Ornithine is associated with the urea cycle.
Explanation of Solution
Ornithine is a nonstandard amino acid and accepts the entering carbamoyl phosphate group at the start of each urea cycle. It is encountered in the first step of the urea cycle.
(b)
Interpretation: To determine whether
Concept introduction: Transamination reaction is a biochemical reaction that involves the transfer of an amino group. In transamination reaction exchange of an amino group from an
A biochemical reaction in which an
A urea cycle is a cyclic biochemical pathway that involves the production of urea using ammonium ions and aspartate molecules as nitrogen sources. The reactants in the formation of carbamoyl phosphate are ammonium ion, water, and carbon dioxide.
(b)

Answer to Problem 15.74EP
The ammonium ion
Explanation of Solution
The ammonium ion is a product of oxidative deamination reaction. A net oxidative deamination reaction is as follows:
It is also associated with the urea cycle. It is fuel for the urea cycle however; it is first converted into carbamoyl phosphate and then enters into the cycle. The net urea cycle is as follows:
(c)
Interpretation: To determine whether
Concept introduction: Transamination reaction is a biochemical reaction that involves the transfer of an amino group. In transamination reaction exchange of an amino group from an
A biochemical reaction in which an
A urea cycle is a cyclic biochemical pathway that involves the production of urea using ammonium ions and aspartate molecules as nitrogen sources. The reactants in the formation of carbamoyl phosphate are ammonium ion, water, and carbon dioxide.
(c)

Answer to Problem 15.74EP
Explanation of Solution
Oxidative deamination reaction of glutamate requires dehydrogenase enzyme. It is an oxidoreductase enzyme and works with either
The oxidative deamination reaction of glutamate amino acid is as follows:
(d)
Interpretation: To determine whether aspartate is associated with (1) transamination, (2) oxidative deamination, or (3) the urea cycle.
Concept introduction: Transamination reaction is a biochemical reaction that involves the transfer of an amino group. In transamination reaction exchange of an amino group from an
A biochemical reaction in which an
A urea cycle is a cyclic biochemical pathway that involves the production of urea using ammonium ions and aspartate molecules as nitrogen sources. The reactants in the formation of carbamoyl phosphate are ammonium ion, water, and carbon dioxide.
(d)

Answer to Problem 15.74EP
Aspartate is associated with the transamination reaction and urea cycle.
Explanation of Solution
Aspartate is a non-essential amino acid. It could function as a product in the transamination reaction.
The reaction is as follows:
Aspartate is also associated with the urea cycle. It is fuel for the urea cycle. It enters directly in step 2 of the cycle and condenses with citrulline to produce argininosuccinate.
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Chapter 15 Solutions
Organic And Biological Chemistry
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