Two nitrogen-containing groups are used to make urea in liver cells. What two molecules of the urea cycle contribute these two nitrogen

Ammonia and aspartate are the two molecules of the urea cycle contribute

these two nitrogen used in the formation of urea.

These compounds are produced in the liver through the breakdown of

amino acids in the liver. The amino acids undergo transamination and

deamination reactions which results in the formation of these compounds.

The ammonia which is highly toxic is converted into urea which is then

excreted from the body.

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NH4+ and aspartate are the two molecules of the urea cycle contribute these two nitrogen.

Explanation:

Two nitrogen-containing groups are used to make urea in liver cells. The nitrogen atoms enter the urea cycle as NH4+ and aspartate. The first step of the urea cycle take place in liver mitochondria. In liver mitochondria, NH4+ combines with HCO3- to form carbamoyl phosphate.

So,

NH4+ and aspartate are the two molecules of the urea cycle contribute these two nitrogen.

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