D-Glucose Is Added to Cells and the Rate of Glucose

question 4

Multiple Choice

D-glucose is added to cells and the rate of glucose transport is plotted against D-glucose concentration.In the presence of the D-galactose derivative 6-O-benzyl-D-galactose,the curve is shifted to the right,indicating that D-glucose and the D-galactose derivative both compete for a place in the binding site.Which of the following is true?

• A)The D-galactose derivative occupies some of the available binding sites.
• B)Given the same concentration of glucose available,the number of binding sites with D-glucose present would decrease.
• C)Given the same concentration of glucose,the rate of D-glucose flux would remain the same with the D-galactose derivative added.
• D)Presumably a higher concentration of D-glucose would be required in order to maintain the same rate of D-glucose flux as before the D-galactose derivative was added.
• E)All of the above are true.

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