Liver Cells Were Monitored for Changes in Metabolic Enzymatic Activity

Multiple Choice

Liver cells were monitored for changes in metabolic enzymatic activity after exposure to glucagon.The enzymes that showed changes in activity were then analyzed to assess if they had been covalently modified.Which of the following results were likely observed?

A) Enzymes that showed lower activity were not phosphorylated.
B) Enzymes that showed higher activity were methylated.
C) Enzymes that showed altered activity (higher or lower) were phosphorylated.
D) Enzymes that showed altered activity (higher or lower) were methylated.