Succinyl CoA is formed by?
**Core Concept**
The formation of Succinyl CoA is a crucial step in the metabolism of certain amino acids and fatty acids. It involves the condensation of a molecule with a CoA group, resulting in a high-energy thioester bond.
**Why the Correct Answer is Right**
Succinyl CoA is formed from the condensation of Acetyl CoA and Oxaloacetate by the enzyme Citrate Synthase in the citric acid cycle (also known as the Krebs cycle or tricarboxylic acid cycle). This reaction is a key step in the metabolism of carbohydrates, fats, and proteins. The enzyme Citrate Synthase catalyzes the formation of Succinyl CoA by linking the carboxyl group of Oxaloacetate to the CoA group of Acetyl CoA.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
The citric acid cycle is a key regulatory point in cellular metabolism, and its intermediates can be used to synthesize a wide range of molecules, including amino acids, nucleotides, and fatty acids. The cycle is also a major source of energy production in the form of ATP, NADH, and FADH2.
**Correct Answer:** C. Citrate Synthase.