how does selective degradation determine the length of time each protein functions in the cell a. Selective degradation determines the length of time each protein functions in the cell by targeting specific proteins for degradation based on their activity or cellular demand. b. Selective degradation determines the length of time each protein functions in the cell by regulating the degradation of proteins based on their cellular location or function. c. Selective degradation determines the length of time each protein functions in the cell by marking proteins for degradation based on their level of misfolding or damage. d. Selective degradation determines the length of time each protein functions in the cell by controlling the degradation of proteins based on their level of phosphorylation or other post-translational modifications.