Multiple ChoiceWhich one of the following sentences is an incorrect description of a reaction in the urea cycle?13views
Multiple ChoiceWhich of the following metabolites is hydrolyzed in the urea cycle to produce ornithine and urea?20views
Multiple ChoiceWhich enzyme catalyzes the reaction of citrulline with aspartate to produce argininosuccinate?17views
Multiple ChoiceWrite the total number of amino acid metabolites in the urea cycle. How many of those amino acids are not found in proteins?15views
Textbook QuestionFumarate from step 3 of the urea cycle may be recycled into aspartate for use in step 2 of the cycle. The sequence of reactions for this process isa. <IMAGE>b. <IMAGE>c. <IMAGE>Classify each reaction as one of the following:1. Oxidation2. Reduction3. Transamination4. Elimination5. Addition30views
Textbook QuestionIn the liver, the relative activity of ornithine transcarbamylase is high, that of argininosuccinate synthetase is low, and that of arginase is high. Why is it important that ornithine transcarbamylase activity be high in the liver? What might be the consequence if arginase activity is low or defective?25views
Textbook QuestionFrom what two amino acids do the nitrogens in urea arise? (Hint: See Figure 25.3.)17views
Textbook QuestionThe net reaction for the urea cycle shows that three ATPs are hydrolyzed; however, the total energy “cost” is four ATPs. Explain why this is true.78views
2:43
