Biology 10th Edition by Eldra Solomon,Charles Martin,Diana Martin,Linda Berg

Exercise 10

interpret data GLUT 4 is a glucose transporter that functions in adipose (fat) cell plasma membranes. An analysis of adipose cells exposed to insulin showed that a single cell could import glucose at a maximum rate of about 1 × 10 8 molecules/second. Under the same conditions, unstimulated cells could only transport a maximum of about 1 × 10 7 molecules/second. What does this finding tell you about the relative number of GLUT 4 transporters functioning in the plasma membranes of stimulated versus unstimulated cells?