Protein Catabolism and Cellular Turnover
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Questions and Answers

What happens to cytosolic proteins when they are no longer needed?

  • They are broken down in lysosomes to create new proteins or enter the citric acid cycle for energy generation (correct)
  • They are immediately expelled from the cell
  • They transform into lipids for cellular membrane synthesis
  • They are stored in the nucleus for future use

What is the fate of amino acids resulting from protein catabolism if not used for synthesizing new proteins?

  • They are converted into nucleic acids for DNA replication
  • They can enter the citric acid cycle for energy generation (correct)
  • They are excreted out of the cell through exocytosis
  • They are stored in vacuoles for later use

In which process do cathepsins and other catabolic enzymes work together?

  • Apoptotic process (correct)
  • Cellular respiration process
  • Cell division process
  • DNA replication process

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