AP BIOLOGY

Detailed explanation-1: -Urea is a nitrogenous waste produced as a by-product of the metabolism of proteins. This process takes place in the liver. It does not occur in the kidney.

Detailed explanation-2: -The urea and water are released from the liver cells to the bloodstream and transported to the kidneys where the blood is filtered and the urea is passed out of the body in the urine. Urea is very soluble and a small molecule, so it is relatively easily passed out by the kidneys as a solution in water.

Detailed explanation-3: -So, the correct option is ‘False’.

Detailed explanation-4: -Urea is the chief end product of nitrogen metabolism in mammals. Most of the urea produced is excreted by the kidneys. Excretion of a large fraction of the urea filtered by the glomerulus is required to keep pace with the rate of hepatic urea production.

Detailed explanation-5: -The liver breaks down excess amino acids to make ammonia, then converts this into urea, which is less toxic in the body than ammonia. Urea travels through the bloodstream to the kidneys, where it is excreted in urine together with water and other impurities.