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13 Dec 2019

In the firs reaction of glycolysis, glucose is converted to _________. The phosphate comes from __________.


A __________ is an enzyme that transfers the terminal phosphate of _________ to a substrate. The product of this reaction is then ______________ to fructose-6-phosphate.


Fructose-6-phosphate is then phosphorylated by a second __________ reaction, giving ___________.

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Reid Wolff
Reid WolffLv2
17 Dec 2019

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Related questions

The conversion of glucose-6-phosphate to fructose-6-phosphate is catalyzed by an isomerase enzyme. Glucose-6-phosphate was mixed with the enzyme under standard conditions and the reaction was allowed to come to equilibrium. If the Keqรขย€ยฒ is 0.50 and the equilibrium [glucose-6-phosphate] is 1.43 M, what is the equilibrium [fructose-6-phosphate]?
1.00 M
1.33 M
0.667 M
0.250 M
0.150 M

The radioactively labeled compound [18F]fluorodeoxyglucose (FDG) is used to measure glucose uptake in cells. FDG, a derivative of glucose in which the C2 hydroxyl is replaced with fluorine, is phosphorylated to FDG-6-phosphate upon entering the cell but cannot proceed any further through glycolysis. The phosphorylated FDG remains in the cell, and its presence can be detected and quantitated, providing information on the rate of glucose uptake. (Cancer cells take up glucose particularly rapidly.)

a. Draw the structure of FDG.

b. Why does phosphorylation trap the FDG in the cell?

c. Why is FDG unable to proceed through glycolysis past the hexokinase reaction? (Hint: When glucose-6-phosphate is converted to fructose-6-phosphate, the ring opens, the isomerization reaction takes place, and then the ring closes again.)

d. Is FDG taken up only by cancer cells?

Can you answer the following questions with work, please?

A) The conversion of glucose-6-phosphate to fructose-6-phosphate is catalyzed by an isomerase enzyme. Glucose-6-phosphate was mixed with the enzyme under standard conditions and the reactions was allowed to come to equilibrium. If the keq' is 0.50 what is the Delta G (degree prime) in kJ/mol?

B) The conversion of glucose-6-phosphate to fructose-6-phosphate is catalyzed by an isomerase enzyme. Under cellular conditions (37*C), the glucose-6-phosphate is 6.6 uM and the fructose-6-phosphate is 1.3 uM. If the keq' is 0.50 what is the Delta G in kJ/mol? (Use the Delta G (degree prime) from the previous question)

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