Which reaction associated with the urea cycle occurs in the cytosol?Group of answer choicesA) the synthesis of carbamoyl phosphateB) the synthesis of citrullineC) the synthesis of argininosuccinateD) the synthesis of both carbamoyl phosphate and citrullineE) the synthesis of both citrulline and argininosuccinate
Question
Which reaction associated with the urea cycle occurs in the cytosol?Group of answer choicesA) the synthesis of carbamoyl phosphateB) the synthesis of citrullineC) the synthesis of argininosuccinateD) the synthesis of both carbamoyl phosphate and citrullineE) the synthesis of both citrulline and argininosuccinate
Solution
The urea cycle involves several reactions that occur in different parts of the cell.
A) The synthesis of carbamoyl phosphate: This reaction occurs in the mitochondria, not the cytosol.
B) The synthesis of citrulline: This reaction also occurs in the mitochondria, not the cytosol.
C) The synthesis of argininosuccinate: This reaction occurs in the cytosol.
D) The synthesis of both carbamoyl phosphate and citrulline: As mentioned above, both of these reactions occur in the mitochondria, not the cytosol.
E) The synthesis of both citrulline and argininosuccinate: The synthesis of citrulline occurs in the mitochondria, while the synthesis of argininosuccinate occurs in the cytosol.
So, the correct answer is C) the synthesis of argininosuccinate. This is the reaction associated with the urea cycle that occurs in the cytosol.
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