Refer to the Graph Below, Showing Changes in the Source

question 171

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.

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