The Ornithine-Urea Cycle Happens in Which Two Locations

Question

The ornithine-urea cycle happens in which two locations?
A)nucleus,endoplasmic reticulum
B)mitochondrion,cytoplasm
C)cytoplasm,intercellular space
D)ribosome,cytoplasm

Accepted Answer

The ornithine-urea cycle occurs in two locations, namely the mitochondrion and the cytoplasm. The reactions involving the synthesis of citrulline occur in the mitochondria, while the reactions involving the synthesis of urea occur in the cytoplasm. Therefore, option B, which lists both the mitochondrion and cytoplasm, is the best choice.