Of the following enzymes from the Pentose Phosphate Pathway, which one interconverts a single monosaccharide into...

Of the following enzymes from the Pentose Phosphate Pathway, which one interconverts a single monosaccharide into its constitutional isomer?
A. Lactonase
B. Transketolase
C. Hexokinase
D. Phosphopentose Epimerase

Solutions

Expert Solution

Isomer are the molecules that have the same chemical formula but a different arrangement of atoms.

Hexokinase phosphorylates glucose to glucose 6-phosphate. Since both are different molecules. So they are not isomers. Both have a different chemical formula. So option B is wrong.

Transketolase transfer ketone group from one molecule to other molecules. So option C is also wrong.

Lactonase carried out the hydrolysis of -6-phosphoglucono-δ-lactone to 6-phosphogluconolactonase. Both have a different chemical formula. So option A is also wrong.

Phosphopentose Epimerase convert ribulose 5-phosphate to xylulose 5-phosphate. Both have the same chemical formula and have a different arrangement of atoms. So correct answer is option D- Phosphopentose Epimerase.

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gladiator answered 1 year ago

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