For enzymes a–e in Problem 35, identify their closest counterparts.

Problem 35

A proposed pathway for ascorbic acid (vitamin C) biosynthesis in plants takes the form

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D-glucose-6-phosphate D-fructose-6-phosphate D-mannose-6-phosphate 3 D-mannose-1-phosphate 6 GDP-D-mannose GDP-L-galactose 8 5 7 L-galactose-1-phosphate L-galactose L-galactono-1,4-lactone L-ascorbic acid 9 Match each of the following enzymes to one of the pathway steps. (a) galactose dehydrogenase (b) GDP-mannose-3,5-epimerase (c) phosphoglucose isomerase (d) phosphomannose isomerase (e) phosphomannose mutase