Why do bacteria perform the emden-Meyerhof pathway, need the pentose- phosphate pathway?

Why do bacteria perform the emden-Meyerhof pathway, need the pentose- phosphate pathway?

A-

photophosphorylation can be cyclical to produce additional ATP molecules. Why can’t oxidative phosphorylation be cyclical?

B-

How can you determine that a bacterium performs the pentose- phosphate cycle?

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