Question

Which reaction in the tca cycle gives electrons to ubiquinone?

a. Step 2
b. Step 6
c. Step 4

Answer 1

In the TCA cycle, ubiquinone receives electrons during Step 3, when isocitrate is oxidized and NAD* is reduced to NADH.Optin c.

Step-by-step explanation:

In the TCA cycle, also known as the Krebs cycle or the citric acid cycle, ubiquinone receives electrons during Step 3.

In Step 3, isocitrate is oxidized, producing a five-carbon molecule, a-ketoglutarate, along with a molecule of CO₂ and two electrons, which reduce NAD* to NADH, eventually transferring electrons to ubiquinone.

Therefore, the mentioned correct option in your final answer should be Step 3, which corresponds to your option C. Step 4 based on the provided materials.