The direct inputs into the mammalian urea cycle, as typically discussed in biology or biochemistry classes, are carbamoyl phosphate and aspartate.

Here's a step-by-step breakdown of the urea cycle:

1. The cycle begins in the mitochondria of liver cells, where the enzyme carbamoyl phosphate synthetase I catalyzes the reaction of ammonia (NH3) and bicarbonate (HCO3-) to form carbamoyl phosphate.

2. This carbamoyl phosphate then reacts with ornithine (a non-proteinogenic amino acid) to form citrulline. This reaction is catalyzed by the enzyme ornithine transcarbamylase.

3. Citrulline then moves out of the mitochondria and into the cytosol, where it reacts with aspartate to form argininosuccinate. This reaction is catalyzed by the enzyme argininosuccinate synthetase and requires ATP.

4. Argininosuccinate is then cleaved by the enzyme argininosuccinase to form arginine and fumarate.

5. Finally, the enzyme arginase cleaves arginine to form urea and ornithine, completing the cycle.

So, the direct inputs into the cycle are carbamoyl phosphate (which is formed from ammonia and bicarbonate) and aspartate.

Question

The direct inputs into the mammalian urea cycle, as typically discussed in biology or biochemistry classes, are carbamoyl phosphate and aspartate.

Here's a step-by-step breakdown of the urea cycle:

1. The cycle begins in the mitochondria of liver cells, where the enzyme carbamoyl phosphate synthetase I catalyzes the reaction of ammonia (NH3) and bicarbonate (HCO3-) to form carbamoyl phosphate.

2. This carbamoyl phosphate then reacts with ornithine (a non-proteinogenic amino acid) to form citrulline. This reaction is catalyzed by the enzyme ornithine transcarbamylase.

3. Citrulline then moves out of the mitochondria and into the cytosol, where it reacts with aspartate to form argininosuccinate. This reaction is catalyzed by the enzyme argininosuccinate synthetase and requires ATP.

4. Argininosuccinate is then cleaved by the enzyme argininosuccinase to form arginine and fumarate.

5. Finally, the enzyme arginase cleaves arginine to form urea and ornithine, completing the cycle.

So, the direct inputs into the cycle are carbamoyl phosphate (which is formed from ammonia and bicarbonate) and aspartate.

Knowee AI · Accepted Answer

The direct inputs into the mammalian urea cycle, as typically discussed in biology or biochemistry classes, are carbamoyl phosphate and aspartate.

Here's a step-by-step breakdown of the urea cycle:

1. The cycle begins in the mitochondria of liver cells, where the enzyme carbamoyl phosphate synthetase I catalyzes the reaction of ammonia (NH3) and bicarbonate (HCO3-) to form carbamoyl phosphate.

2. This carbamoyl phosphate then reacts with ornithine (a non-proteinogenic amino acid) to form citrulline. This reaction is catalyzed by the enzyme ornithine transcarbamylase.

3. Citrulline then moves out of the mitochondria and into the cytosol, where it reacts with aspartate to form argininosuccinate. This reaction is catalyzed by the enzyme argininosuccinate synthetase and requires ATP.

4. Argininosuccinate is then cleaved by the enzyme argininosuccinase to form arginine and fumarate.

5. Finally, the enzyme arginase cleaves arginine to form urea and ornithine, completing the cycle.

So, the direct inputs into the cycle are carbamoyl phosphate (which is formed from ammonia and bicarbonate) and aspartate.

Which of the following best describes the direct inputs into the mammalian urea cycle as discussed in class?Group of answer choicesuric acid and HCO3-serine and HCO3-carbamoyl phosphate and aspartateammoniacarbamoyl phosphate and alanine

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