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Which of the following pathways is used as an alternative glycolytic pathway by all cells and whose intermediates are used to make nucleotides?

A. Phosphogluconate pathway
B. Pentose phosphate pathway
C. Entner-Duodoroff pathway
D. Embden-Meyerhof-Parnas pathway

Answer :

Final answer:

The Pentose Phosphate Pathway is used as an alternative glycolytic pathway by all cells, and its intermediates are used in nucleotide biosynthesis. Option B.

Explanation:

The pathway used as an alternative glycolytic pathway by all cells, and whose intermediates are used to make nucleotides, is the Pentose Phosphate Pathway. This pathway plays a vital role in the generation of NADPH for biosynthetic reactions and maintaining the balance of redox reactions.

In this pathway, glucose-6-phosphate is oxidized and decarboxylated to yield pentose phosphates, which are precursors for the biosynthesis of nucleotides. Other pathways, such as the Phosphogluconate Pathway, Entner-Duodoroff Pathway, and Embden-Meyerhof-Parnas Pathway, also exist, but they play different roles in cellular metabolism or are not universally used by all cells. Answer option B.

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