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Multiple Choice
Which of the following is not a lipid?
A
Cholesterol
B
Triglyceride
C
Phospholipid
D
Glucose
Verified step by step guidance
1
Understand the definition of lipids: Lipids are a diverse group of compounds that are insoluble in water but soluble in organic solvents. They include fats, oils, waxes, certain vitamins, hormones, and most non-protein membrane components.
Identify the common types of lipids: The main categories of lipids include triglycerides, phospholipids, and sterols (such as cholesterol). These are all characterized by their hydrophobic properties.
Examine the structure of each option: Cholesterol is a sterol, triglycerides are esters derived from glycerol and three fatty acids, and phospholipids contain a glycerol backbone, two fatty acid tails, and a phosphate group.
Consider the structure of glucose: Glucose is a simple sugar or monosaccharide, which is a carbohydrate, not a lipid. It is soluble in water and does not share the hydrophobic characteristics of lipids.
Conclude by identifying the non-lipid: Based on the structural and solubility characteristics, glucose is not a lipid, while cholesterol, triglycerides, and phospholipids are all classified as lipids.