Example: Lecithin, CephalinExample: SphingomyelinPredominant lipids in membranesFound in myelin sheath of nerve fibers","creatorId":44,"createdAt":null,"updatedAt":"2025-08-21T06:56:10.508Z"} 39:{"id":1484,"questionId":921,"text":"Lecithin and Cephalin.","answer":"

Lecithin	Cephalin
Phosphatidic acid + Choline	Phosphatidic acid + Ethanolamine or Serine
Most abundant phospholipid in cell membrane	Present in cell membrane
Major component of lung surfactant	Phosphatidylserine involved in apoptosis

","creatorId":44,"createdAt":null,"updatedAt":"2025-08-21T06:56:10.508Z"} 37:["$38","$39"] 34:{"id":921,"quizId":112,"image":null,"width":null,"height":null,"creatorId":44,"createdAt":null,"updatedAt":"2025-08-21T06:56:10.492Z","tapes":"$35","masks":"$36","subQuestions":"$37"} 3b:[] 3c:[] 3e:{"id":1485,"questionId":922,"text":"[Explain] The role of phosphatidylinositol in cell signaling.","answer":"

Phosphatidylinositol 4,5-bisphosphate (PIP₂) acts as a secondary messenger in intracellular signal transduction. When hydrolyzed by phospholipase C, it produces inositol trisphosphate (IP₃) and diacylglycerol (DAG), which mediate various cellular responses such as calcium release and protein kinase C activation.

","creatorId":44,"createdAt":null,"updatedAt":"2025-08-21T06:56:10.509Z"} 3f:{"id":1486,"questionId":922,"text":"The hazards of lecithin deficiency.","answer":"

Deficiency of lecithin leads to: 1) Impaired cell membrane structure and function, 2) Disrupted plasma lipid transport, 3) Reduced choline availability for neurotransmitter synthesis and methylation reactions, and 4) Respiratory distress syndrome in premature infants due to lack of lung surfactant, causing alveolar collapse and breathing difficulties.

","creatorId":44,"createdAt":null,"updatedAt":"2025-08-21T06:56:10.509Z"} 3d:["$3e","$3f"] 3a:{"id":922,"quizId":112

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