Which of the following enzymes catalyzes a reaction of the citric acid cycle that does not produce reduced electron carriers?
a) malate dehydrogenase
b) succinate dehydrogenase
c) succinyl coa synthetase
d) α-ketoglutarate dehydrogenase
e) isocitrate dehydrogenase

C) Succinyl CoA synthetase

Explanation:

Malate dehydrogenase converts L-Malate and NAD⁺ to Oxaloacetate,  NADH and H⁺ . Reduced electron carrier - NADH is produced.

Succinate dehydrogenase converts succinate and FAD to fumarate and FADH₂ . Reduced electron carrier - FADH₂ is produced.

α-ketoglutarate dehydrogenase converts α-Ketoglutarate, NAD⁺ and CoA-SH to Succinyl-CoA, NADH, H⁺ and CO₂. Reduced electron carrier - NADH is produced.

Isocitrate dehydrogenase converts Isocitrate and NAD⁺ to α-Ketoglutarate, NADH, H⁺ and CO₂. Reduced electron carrier - NADH is produced.

But on the other hand, Succinyl CoA synthetase Succinyl-CoA, GDP and Pi to Succinate, CoA-SH and GTP and thus no reduced electron carrier is produced.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error