D. How would the rate of glucose transport into the liver cell change if the energy charge were to become low? Justify your answer. E. How would the rate of glucose transport into the brain cell change if the energy charge of the cell were to become high? Justify your answer.

Basic Clinical Laboratory Techniques 6E
6th Edition
ISBN:9781133893943
Author:ESTRIDGE
Publisher:ESTRIDGE
Chapter6: Basic Clinical Chemistry
Section6.4: Point-of-care Testing
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Need help with D and E on problem 6!

**Problem 5:**
Suppose a cell expresses HK-I and 5 mM is the concentration of glucose in the blood. Compare the cellular concentration of glucose (relative to 5 mM) based on the G6P concentration in the cell being low or high. 

**Problem 6:**
Brain cells express HK-I and liver cells express HK-IV. This differential gene expression is an adaptation of cellular function to the blood glucose concentration, which averages 4-5 mM in a healthy body. Consider the specific conditions as shown in the figure.

**Diagram Description:**
The diagram illustrates two different types of cells and their respective enzymes and G6P concentrations:
- A **brain cell** expresses HK-I and has low G6P concentration.
- A **liver cell** expresses HK-IV and has low G6P concentration.

Both cells are exposed to a blood glucose concentration of 5 mM.

**Questions:**

**A.** In which cell is the rate of G6P formation greater? Justify your answer.

**B.** Which cell has the higher rate of net glucose transport? Justify your answer.

**C.** Give a reason to expect high G6P concentration in a cell with high energy charge.

**D.** How would the rate of glucose transport into the liver cell change if the energy charge were to become low? Justify your answer.

**E.** How would the rate of glucose transport into the brain cell change if the energy charge of the cell were to become high? Justify your answer.
Transcribed Image Text:**Problem 5:** Suppose a cell expresses HK-I and 5 mM is the concentration of glucose in the blood. Compare the cellular concentration of glucose (relative to 5 mM) based on the G6P concentration in the cell being low or high. **Problem 6:** Brain cells express HK-I and liver cells express HK-IV. This differential gene expression is an adaptation of cellular function to the blood glucose concentration, which averages 4-5 mM in a healthy body. Consider the specific conditions as shown in the figure. **Diagram Description:** The diagram illustrates two different types of cells and their respective enzymes and G6P concentrations: - A **brain cell** expresses HK-I and has low G6P concentration. - A **liver cell** expresses HK-IV and has low G6P concentration. Both cells are exposed to a blood glucose concentration of 5 mM. **Questions:** **A.** In which cell is the rate of G6P formation greater? Justify your answer. **B.** Which cell has the higher rate of net glucose transport? Justify your answer. **C.** Give a reason to expect high G6P concentration in a cell with high energy charge. **D.** How would the rate of glucose transport into the liver cell change if the energy charge were to become low? Justify your answer. **E.** How would the rate of glucose transport into the brain cell change if the energy charge of the cell were to become high? Justify your answer.
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