Which of the following pentose sugars is a key intermediate in the pentose phosphate pathway?

A Ribose-5-phosphate ✓
B Xylulose-5-phosphate
C Sedoheptulose-7-phosphate
D Erythrose-4-phosphate

Explanation

Ribose-5-phosphate is a key intermediate in the pentose phosphate pathway, which generates NADPH and pentoses from glucose-6-phosphate.

Source

Stryer Biochemistry
Carbohydrate Metabolism Biochemistry Pentose Phosphate Pathway Hard MEDICAL Confidence: high