Identify the below structural formula along with its related function
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Recognise phospholipids (glycerol + 2 fatty acids + phosphate + head group) as membrane components (e.g., lecithin).
Cholesterol is a sterol present in animal membranes (stabiliser).
Triglycerides lack a phosphate head and are storage lipids (energy reserve).
1. The question asks to identify a structural formula and match it to function. Among the options, lecithin (phosphatidylcholine) is a typical phospholipid with a glycerol backbone, two fatty acid chains and a phosphate–choline head group; lecithin molecules are major components of biological membranes.
2. Cholesterol is also a membrane component (option 1 is true as a statement), adenosine is a nucleoside present in nucleic acids (option 2 is true as a statement), and triglycerides function as energy storage (option 4 true as a statement).
3. However, the structural formula most classically shown in such MCQs for "identify the below structural formula" and "component of cell membrane" is usually a phospholipid (lecithin). Therefore the best choice matching a typical membrane phospholipid structural formula is lecithin.
4. Hence the correct answer (most likely intended) is (3) Lecithin - A component of cell membrane.
