Question

question 6 (1 point)
after citrate is formed in the citric acid cycle, it is converted into its isomer ______.
○ α - ketoglutarate
○ fructose - 6 - phosphate
○ malate
○ isocitrate

Explanation:

In the citric acid cycle, after citrate is formed, the next step involves its isomerization. The enzyme aconitase catalyzes the conversion of citrate to its isomer isocitrate. α - ketoglutarate is formed later in the cycle from isocitrate, fructose - 6 - phosphate is part of glycolysis (not the citric acid cycle's immediate next step after citrate), and malate is also a later intermediate in the citric acid cycle. So the correct isomer of citrate in this step is isocitrate.

Answer:

D. isocitrate (Note: Assuming the options are labeled as A. α - ketoglutarate, B. fructose - 6 - phosphate, C. malate, D. isocitrate)