The fructose is more symmetrical.
The major objective in glycolysis is to break one 6-carbon glucose into two 3-carbon pyruvate molecules. Part of the strategy that is employed is to, early on, make the molecule as symmetrical as possible. Cyclized glucose has only one carbon external to the ring; by contrast there are several possible forms of cyclized fructose, including a form that has four carbons internal to the ring and both the 1-C and the 6-C external to the ring. That last form is superior to glucose in terms of symmetry and potential for being split into nearly identical 3-C units (which through a bit of processing will indeed become identical 3-C pyruvates).
The cytoplasmic mechanism known as glycolysis converts glucose into two molecules with a total of three carbons and energy. With the aid of the enzyme hexokinase, glucose is bound via phosphorylation. The result of this process, glucose-6-P, inhibits hexokinase and uses adenosine triphosphate (ATP) as the energy source.
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