Glucose Enters Erythrocytes Via a GLUT-1 Uniporter

question 35

Multiple Choice

Glucose enters erythrocytes via a GLUT-1 uniporter.As the levels of glucose in the bloodstream decrease between meals,what happens to the glucose in the cells?

• A)Glucose leaves the cell through the GLUT-1 uniporter,traveling down the new concentration gradient.
• B)Glucose remains in the cell because uniporters can only transport in one direction.
• C)Glucose remains in the cell because the GLUT-1 uniporters are gated and the gates close at low glucose concentrations.
• D)Glucose remains in the cell because it has been phosphorylated and no longer has affinity for the GLUT-1 uniporter.

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