Which one of the following statements about the urea cycle is correct? Group of answer choices The two nitrogen atoms that are incorporated into urea enter the cycle as ammonium and arginine. Urea is produced directly by the hydrolysis of

Let's analyze each of the statements provided regarding the urea cycle: 1. **The two nitrogen atoms that are incorporated into urea enter the cycle as ammonium and arginine.** - This statement is **incorrect**. The two nitrogen atoms in urea are derived from one being contributed by ammonia (NH4+) and the other from aspartate, not arginine. 2. **Urea is produced directly by the hydrolysis of argininosuccinate.** - This statement is **incorrect**. Urea is produced from the hydrolysis of arginine, which is formed from argininosuccinate after its cleavage into arginine and fumarate in the urea cycle. 3. **Urinary urea is increased by a New life diet.** - This statement is dependent on specific dietary contents, and without more information on what the "New life diet" entails, it's unclear whether this statement is universally correct or incorrect. 4. **ATP is required for the reaction in which fumarate is cleaved to form arginine.** - This statement is **incorrect**. The conversion of argininosuccinate to arginine and fumarate does not require ATP; instead, it is a reversible reaction catalyzed by the enzyme argininosuccinate lyase. Based on this analysis, none of the provided statements about the urea cycle are correct except for the third, albeit conditionally based on dietary composition. You may need to double-check the details associated with the "New life diet" statement for a more precise answer.