Protein Metabolism Quiz

Urea cycle takes place in

• Muscle cell

• Kidney

• Liver cell

• Heart

Answer explanation

The urea cycle occurs in liver cells. It is responsible for converting toxic ammonia into urea, which can be safely excreted by the kidneys.

Urea cycle takes place in which part of cell

• Mitochondrion

• Cytoplasm

• Both a&b

• None of these

Answer explanation

The urea cycle takes place in both the mitochondrion and the cytoplasm of the cell. This is where the conversion of ammonia to urea occurs.

Cori cycle is

• Synthesis of glucose

• Break down of glucose

• anaerobic breakdown of glucose

• all of the above

Answer explanation

Cori cycle is the anaerobic breakdown of glucose, which involves the synthesis and breakdown of glucose. Therefore, the correct answer is 'all of the above'.

Toxic ammonia converted into nontoxic urea this process is called

• Urea cycle

• Ornithine cycle

• Kreb'sHenseleit cycle

• All of the above

Answer explanation

Toxic ammonia is converted into nontoxic urea through the urea cycle. This process ensures the elimination of ammonia from the body. The correct choice is 'Urea cycle'.

Synthesis of carbamoyl phosphate requires

• 2CO, 2NH3 and 2ATP

• CO2, NH4 and 2ATP

• SO2, NH3 and 1ATP

• CHO2, 2NH3 and 2ATP

Answer explanation

The synthesis of carbamoyl phosphate requires 2CO, 2NH3, and 2ATP. This combination of molecules is necessary for the formation of carbamoyl phosphate.

In urea cycle, Carbamoyl phosphate synthesis takes place in

• Cytosol

• Mitochondria

• Both a&b

• Endoplasmic reticulum

Answer explanation

Carbamoyl phosphate synthesis in the urea cycle occurs in the cytosol. It does not take place in the mitochondria, endoplasmic reticulum, or both a&b.

In urea cycle, urea synthesis takes place in

• Cytosol

• Mitochondria

• Both a&b

• None of these

Answer explanation

Urea synthesis occurs in the cytosol during the urea cycle.

Urea synthesis takes place in

• Kidney

• Liver

• Heart

• Brain

Answer explanation

Urea synthesis occurs in the liver. It is not produced in the kidney, heart, or brain. The liver plays a crucial role in the metabolism of nitrogenous waste, converting ammonia into urea for excretion.

In urea cycle, which of the following enzyme present in mitochondria i. Carbamoyl phosphate synthetase ii. Argininosuccinate synthetase iii. Arginase iv. Ornithine transcarbamoylase

• i, ii, iii, iv

• i, iii, iv

• i&iv

• i only

Answer explanation

Carbamoyl phosphate synthetase and Ornithine transcarbamoylase are the enzymes present in mitochondria in the urea cycle. Therefore, the correct choice is i&iv.

How many ATP utilises in urea synthesis?

• 1

• 2

• 3

• 4

Answer explanation

Urea synthesis utilizes 2 ATP molecules. This is the correct choice.