Question

In a comparison of amounts of urea in human urine , the largest amount of urea would be found with the diet very rich in
A) Animal fat
B) Simple carbohydrate(sucrose)
C) Complex carbohydrate (starches)
D) Protein

Answer 1

Hint:Metabolic wastes are substances left over from metabolic processes which cannot be used by the organism,and sometime may be toxic to humans and must therefore be excreted. This includes nitrogen compounds, water, carbon dioxide , phosphates, sulphates, etc. Animals consider these compounds as excretes.

Complete answer:
The end product of carbohydrate metabolism is pyruvate or lactate. Protein metabolism contributes 2%–3% of the energy prerequisite in exercise of a few minutes duration and rises to as much as twelve percent after several hours of physical work. This role of protein catabolism in behind glucose and lipid oxidation, called anaplerosis, may be more important than its direct input to energy supply. Foods rich in protein are transformed to the nine essential and eleven nonessential amino acids. The variation between the two groups is that the essential amino acids cannot be synthesized in the body and, therefore, they must be provided in the diet or proteins cannot be synthesized.

Amino acids have two fates,first one is they can be used to synthesize protein and the second one is they are ruined in a monotonous fashion in which the α-amino group is detached and converted to urea in the liver. As well as urea production serves as an estimate of the buildup of putative uremic toxins and, thus, as a principle for management of the diets of patients with chronic kidney disease. When we are taking a protein-rich diet, the highest amount of urea can be found in urine.The end product or the metabolic waste of protein metabolism is urea which are seen in very high amounts in urine when protein the diet rich in protein is ingested.

Hence the correct answer is option ‘D’.

Note:All the metabolic wastes are excreted in a form of water solutes via the excretory organs with the exception of $CO_2$, which is excreted jointly with the water vapor throughout the lungs. The removal of these compounds enables the chemical homeostasis of the organism.