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Why a cis double bond isomer can't continue in the Kreb's cycle

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Why must the fumaric acid produced in step 6 of the citric acid cycle have a trans double bond to continue in the cycle? Why can't the corresponding cis double bond isomer continue in the cycle?

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This solution explains in 73 words what a fumaric acid bond is and why a cis double bond isomer cannot continue in Kreb's cycle.

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The fumaric acid produced in the sixth step of the citric acid cycle must have a trans double bond ...

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