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Questions and Answers
What is the main function of the urea cycle?
What is the main function of the urea cycle?
- Breakdown of amino acids for energy storage
- Excretion of nitrogen in the form of urea (correct)
- Regulation of carbohydrate metabolism
- Synthesis of glutamine
How is excess nitrogen eliminated in the body?
How is excess nitrogen eliminated in the body?
- By releasing it through respiration
- By converting it to glycogen
- Through the urea cycle (correct)
- By synthesizing more amino acids
What happens to the concentration of urea-cycle enzymes with long-term changes in dietary protein?
What happens to the concentration of urea-cycle enzymes with long-term changes in dietary protein?
- It increases slightly
- It remains constant
- It can change by 20-fold or greater (correct)
- It decreases gradually
In conditions of starvation, why do enzyme levels in the urea cycle rise?
In conditions of starvation, why do enzyme levels in the urea cycle rise?
What is cirrhosis of the liver and where does it rank in causes of death for the 45–65 age group?
What is cirrhosis of the liver and where does it rank in causes of death for the 45–65 age group?
What are the most common causes of cirrhosis in the Western world?
What are the most common causes of cirrhosis in the Western world?
What is the significance of glutamate dehydrogenase and glutamine synthetase in peripheral tissues?
What is the significance of glutamate dehydrogenase and glutamine synthetase in peripheral tissues?
How is reduced nitrogen primarily removed in the brain?
How is reduced nitrogen primarily removed in the brain?
What does the statement 'The urea cycle operates only to eliminate excess nitrogen' imply?
What does the statement 'The urea cycle operates only to eliminate excess nitrogen' imply?
How do urea-cycle enzymes respond to changes in dietary protein levels?
How do urea-cycle enzymes respond to changes in dietary protein levels?
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