A major lipid of mitochondrial membrane is
**Core Concept**
The question is testing knowledge about the composition and function of mitochondrial membranes, which are crucial for energy production in cells. Mitochondrial membranes contain various lipids that play a vital role in maintaining their structure and function.
**Why the Correct Answer is Right**
The correct answer is Cardiolipin, a unique lipid molecule found predominantly in the inner mitochondrial membrane. Cardiolipin is essential for maintaining the structural integrity of the mitochondrial cristae, which are involved in the process of oxidative phosphorylation. It also plays a crucial role in the regulation of mitochondrial dynamics and the prevention of apoptosis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a lipid associated with mitochondrial membranes. Phosphatidylserine is a phospholipid found in various cellular membranes, but it is not a major lipid in mitochondrial membranes.
**Option B:** This option is not directly related to mitochondrial membranes. Phosphatidylinositol is a phospholipid involved in cell signaling pathways but is not a major lipid in mitochondrial membranes.
**Option C:** This option is incorrect because while phosphatidylethanolamine is a phospholipid found in various cellular membranes, it is not a major lipid in mitochondrial membranes.
**Clinical Pearl / High-Yield Fact**
Cardiolipin is a unique lipid molecule that is essential for maintaining mitochondrial function and preventing mitochondrial dysfunction, which can lead to various diseases, including neurodegenerative disorders and metabolic disorders.
**Correct Answer: C. Cardiolipin**