Amino Acids and Protein Metabolism Quiz 1

In lysosomal degradation, which process involves the engulfment of large particles such as bacteria or cellular debris?

• Pinocytosis

• Autophagy

• Phagocytosis

• Transamination

What is the primary function of the 26S proteasome in the cell?

• Synthesizing proteins

• Degrading misfolded or damaged proteins

• Storing genetic information

• Generating ATP

Which of the following pathways is responsible for the selective degradation of intracellular proteins?

• Lysosomal degradation

• Ubiquitin-proteasome pathway

• Glycolysis

• Citric acid cycle

In the ubiquitin-proteasome pathway, which enzyme is responsible for transferring ubiquitin to the target protein?

• E1

• E2

• E3

• Proteasome

What is the coenzyme required by transaminases for their catalytic activity?

• FAD

• CoA

• NAD+

• PLP

What is the main toxic product formed during the deamination of amino acids?

• Urea

• Ammonia

• CO₂

• Hydrogen Peroxide

What happens to NH3 in the mitochondria if it accumulates?

• It is excreted through the lungs

• It forms urea

• It causes inhibition of respiration

• It becomes a neurotransmitter

Which cycle is primarily responsible for the detoxification and disposal of ammonia?

• Kreb's cycle

• Glycolysis

• Urea cycle

• Pentose phosphate cycle

Where does urea formation take place in ureotelic organisms?

• Lungs

• Liver

• Heart

• Kidney

Which enzyme catalyzes the formation of carbamoyl phosphate in the urea cycle?

• Ornithine carbamoyl transferase

• Carbamoyl phosphate synthase

• Pyrophosphatase

• Argininosuccinate synthetase