AP BIOLOGY

Detailed explanation-1: -This reaction occurs with the help of the enzyme phosphoglucose isomerase (PI). As the name of the enzyme suggests, this reaction involves an isomerization reaction. Glucose and fructose are isomers.

Detailed explanation-2: -Glucose-6-phosphate (G6P) is changed into fructose-6-phosphate (F6P) by phosphoglucoisomerase (phosphoglucose isomerase) in the second step.

Detailed explanation-3: -Phosphofructokinase catalyzes the conversion of fructose-6-phosphate to fructose-1, 6-diphosphate and is a key regulatory enzyme of glycolysis.

Detailed explanation-4: -Phosphoglucose isomerase. Glucose 6-phosphate (G6P) is converted to its isomer, fructose 6-phosphate (F6P). This moves the carbonyl nearer to the middle of the molecule, preparing it to be divided into two triose (3-carbon) molecules.

Detailed explanation-5: -During glycolysis, the glucose is converted into its isomer fructose by the phosphoglucose isomerase enzyme because glucose contains an aldehyde group at C-1 that cannot be phosphorylated.