Refer to the Graph Below, Showing Changes in the Source

Multiple Choice

Refer to the graph below, showing changes in the source of blood glucose as a person goes from a state of active food intake to a state of starvation. The person's blood glucose levels remain very stable; only the source of glucose changes.Liver cells play an active role in maintaining the stable levels of blood glucose.Which changes in liver cell metabolism could account for the data shown?

A) At 1 hour after eating, liver cells inhibit phosphofructokinase and activate enzymes involved in glycogen breakdown.
B) At 4 hours after eating, liver cells activate enzymes involved in glycogen breakdown as well as enzymes involved in the breakdown of proteins and lipids.
C) At 10 hours after eating, liver cells activate fatty acid synthase and inhibit enzymes involved in the breakdown of proteins and lipids.
D) At 2 days into starvation, liver cells activate phosphofructokinase and inhibit enzymes involved in glycogen breakdown.
E) At 16 days into starvation, liver cells activate phosphofructokinase and inhibit enzymes involved in the breakdown of proteins and lipids.