Question

Ammonia is converted into urea in
A. Kidney
B. Spleen
C. Liver
D. Nephron

Answer 1

Hint: An organ that removes toxins from various metabolites and helps in the process of digestion which is located at the upper right side of the abdomen and below the diaphragm and is surrounded by the ribcage.

Complete answer:
The process of conversion of ammonia into urea is known as the urea cycle which occurs in the liver and then urea is transferred to the kidney for excretion.

Additional Information:
 -Ammonia is a toxic element even when present in small amounts and must be immediately removed from the body.
-Ammonia is a waste which is formed by amino acid catabolism.
-Ammonia is a nitrogenous waste that is formed generally in aquatic organisms.
-The ammonia needs to be removed from the body as fast as possible or else it will become detrimental.
-Those organisms which cannot remove their nitrogenous waste mostly ammonia will convert it into urea or uric acid.
-This process of conversion of ammonia into urea is known as the urea cycle or ornithine cycle, which takes place in the liver.
-In the liver, urea is produced which is then transferred into the bloodstream and from the bloodstream to the kidney for excretion.
-Urea is excreted as a solution present in the urine.
-Those organisms that excrete urea are termed as ureotelic while those organisms which excrete ammonia are termed as ammonotelic.
So, the correct answer is ‘Liver'.

Note: The urea cycle was discovered after five years of the discovery of the TCA (Tricarboxylic acid cycle or Krebs cycle) cycle. It was the first metabolic cycle that was discovered in 1932 by Hans Kreb and Kurt Henseleit. The urea cycle was described in more detail by Ratner and Cohen. It occurs mostly in ammonotelic organisms.