Which statement about protein turnover is accurate?

Which statement about protein turnover is accurate?

• A. It occurs in all cells at the same time as protein synthesis.
• B. It is less sensitive to hormones than protein synthesis.
• C. It occurs only in muscle cells.
• D. It is unaffected by dietary factors.

Answer: (A)

Protein turnover is a continuous, dynamic process where proteins are routinely broken down and rebuilt. This happens in virtually all cells, with degradation and synthesis occurring in parallel as the cell replaces damaged or worn-out proteins and adjusts protein levels to meet needs. Hormonal signals and dietary status can modulate both sides of this process, so turnover is not immune to dietary factors or hormones. Because turnover reflects ongoing, concurrent synthesis and degradation across many cell types, the statement that it occurs in all cells at the same time as protein synthesis best captures how turnover operates.

Protein turnover is a continuous, dynamic process where proteins are routinely broken down and rebuilt. This happens in virtually all cells, with degradation and synthesis occurring in parallel as the cell replaces damaged or worn-out proteins and adjusts protein levels to meet needs. Hormonal signals and dietary status can modulate both sides of this process, so turnover is not immune to dietary factors or hormones. Because turnover reflects ongoing, concurrent synthesis and degradation across many cell types, the statement that it occurs in all cells at the same time as protein synthesis best captures how turnover operates.