Multiple Choice
In the synthetic pathway of serine, 3-phosphoglycerate must first be converted into 3-phosphohydroxypyruvate.
Identify the type of reaction represented by this conversion.
25. Protein and Amino Acid Metabolism
Review of Metabolism
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following statements is incorrect?
A
Ammonia molecules are converted to carbamoyl phosphate before entering the Urea Cycle.
B
The production of urea requires the reaction between water and a glutamate molecule.
C
The Urea Cycle excretes urea as a waste material by using NH4+ and aspartate as the sources of nitrogen.
D
It requires 4 total ATP molecules to produce one urea molecule.
Verified step by step guidance1
Understand the context of the Urea Cycle: The Urea Cycle is a series of biochemical reactions that produce urea from ammonia. It is a crucial process for removing excess nitrogen from the body.
Identify the role of ammonia: Ammonia is converted to carbamoyl phosphate before entering the Urea Cycle. This conversion is an essential step in the cycle.
Clarify the sources of nitrogen: The Urea Cycle uses NH4+ (ammonium ion) and aspartate as sources of nitrogen to form urea, which is then excreted as waste.
Examine the energy requirement: The cycle requires ATP molecules to drive the reactions. Specifically, it requires 4 ATP molecules to produce one molecule of urea.
Evaluate the statement about glutamate and water: The production of urea does not involve a direct reaction between water and a glutamate molecule. This statement is incorrect, as glutamate is involved in transamination reactions but not directly in the formation of urea.
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