A. $\alpha$ Ketoglutarate
B. Succinyl CoA
C. Fumarate
D. Citrate
E. Oxaloacetate
Choose the correct answer from the options given below:
The question asks to identify the correct sequence of intermediates in the Tricarboxylic Acid (TCA) cycle.
TCA Cycle Intermediate Sequence
The key molecules mentioned are:
- A. $\alpha$-Ketoglutarate
- B. Succinyl CoA
- C. Fumarate
- D. Citrate
- E. Oxaloacetate
Step-by-Step Pathway Analysis
Let's trace the sequence of these intermediates in the TCA cycle:
- The cycle begins with the formation of Citrate (D) from Acetyl-CoA and Oxaloacetate (E).
- Citrate (D) is subsequently converted through a series of reactions into $\alpha$-Ketoglutarate (A).
- $\alpha$-Ketoglutarate (A) is then converted into Succinyl CoA (B).
- Succinyl CoA (B) is further processed to yield Fumarate (C) (via Succinate).
- Finally, Fumarate (C) is converted back into Oxaloacetate (E) (via Malate), completing the cycle which then regenerates Citrate with Acetyl-CoA.
Based on this pathway, the correct sequence representing these specific intermediates is Citrate $\rightarrow$ $\alpha$-Ketoglutarate $\rightarrow$ Succinyl CoA $\rightarrow$ Fumarate $\rightarrow$ Oxaloacetate.
Identifying the Correct Option
Matching this sequence with the given labels:
- D. Citrate
- A. $\alpha$-Ketoglutarate
- B. Succinyl CoA
- C. Fumarate
- E. Oxaloacetate
The sequence is D, A, B, C, E. This corresponds to option 2.
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