MPSC Rajyaseva 2022 GS Paper 1 — Question 49

झाडांच्या श्वासोच्छवासाच्या क्रेब्च्या चक्रादरम्यान खालीलपैकी कोणत्या प्रक्रियेद्वारे फ्यूमॅरीक अॅसिडचे रूपांतर मॅलीक अॅसिड मध्ये होते ? During Krebs cycle in respiration, fumaric acid gets converted into malic acid by

In the Krebs cycle, the enzyme fumarase converts fumarate to malate by adding a water molecule across its double bond -- this is a hydration reaction, not dehydrogenation or dehydration. Note: MPSC's own published answer key for this question lists option 2 (dehydrogenation), which conflicts with standard biochemistry -- this looks like an error in the official key itself, so the scientifically correct answer (hydration) is shown here instead.