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lipids triglycerides phospholipids
A LevelBiology~4 min read
Overview
This lesson explores lipids, focusing on the structure, properties, and functions of triglycerides and phospholipids. We will delve into their chemical composition, how they are formed, and their crucial roles in living organisms, from energy storage to membrane formation.
Introduction to Lipids
Lipids are a broad and diverse group of organic compounds that share the common characteristic of being **insoluble in water** but soluble in organic solvents like ethanol or ether. This insolubility stems from their largely non-polar nature, which contrasts sharply with the polarity of water. Unlik...
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Key Concepts
- Lipids: A diverse group of organic compounds that are largely non-polar and insoluble in water, including fats, oils, waxes, and steroids.
- Triglyceride: A lipid molecule composed of one glycerol molecule ester-linked to three fatty acid molecules, primarily used for energy storage.
- Phospholipid: A lipid molecule composed of one glycerol molecule, two fatty acids, and a phosphate group, forming the primary component of cell membranes.
- Ester bond: The covalent bond formed between a hydroxyl group and a carboxyl group, releasing a molecule of water (condensation reaction).
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Exam Tips
- →Be able to draw and label the basic structures of glycerol, a fatty acid, a triglyceride, and a phospholipid. Pay attention to the ester bonds and the phosphate group.
- →Clearly explain the difference between saturated and unsaturated fatty acids, relating their structure to their physical properties (solid vs. liquid at room temperature).
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