What is a suitable description of the function of stage III of the pentose phosphate pathway? (a) it generates NADPH and CO2 (b) it generates ribose-5-phosphate for use in nucleotide biosynthesis (c) it generates 6-phosphogluconate and ribulose-5-phosphate (d) it is used to generate sedoheptulose-7P for use in cell wall biosynthesis (e) it is used to transport organic phosphates from mitochondria into the cytosol .