NEET Exam > NEET Videos > Biology Class 11 > Lipids: Fatty acids & Phospholipids
Lipids: Fatty acids & Phospholipids Video Lecture | Biology Class 11 - NEET
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FAQs on Lipids: Fatty acids & Phospholipids Video Lecture - Biology Class 11 - NEET
| 1. What are fatty acids? |  |
Fatty acids are organic compounds that are essential for various biological processes in the body. They are a major component of lipids, which are molecules that store energy and serve as structural components of cell membranes. Fatty acids consist of a long hydrocarbon chain with a carboxyl group at one end. They can be classified as saturated or unsaturated based on the presence or absence of double bonds in their hydrocarbon chain.
| 2. How do fatty acids contribute to the formation of lipids? | |
Fatty acids play a crucial role in the formation of lipids. They combine with glycerol molecules through a process called esterification to form triglycerides, which are the most common type of lipid found in the body. Triglycerides serve as a concentrated energy source, insulation, and cushioning for vital organs. Additionally, fatty acids can also combine with other molecules, such as cholesterol, to form complex lipids like phospholipids and steroid hormones.
| 3. What are phospholipids? | |
Phospholipids are a type of lipid that is composed of two fatty acids, a glycerol molecule, and a phosphate group. They are a major component of cell membranes and play a crucial role in maintaining the integrity and functionality of cells. Phospholipids have a hydrophilic head (containing the phosphate group) and two hydrophobic tails (composed of the fatty acids). This unique structure allows phospholipids to form a lipid bilayer, with the hydrophilic heads facing outward and the hydrophobic tails facing inward, creating a barrier that separates the cell from its surroundings.
| 4. How do phospholipids contribute to the structure and function of cell membranes? | |
Phospholipids are the main building blocks of cell membranes. The lipid bilayer formed by phospholipids acts as a selectively permeable barrier, controlling the movement of substances in and out of the cell. The hydrophilic heads of phospholipids interact with water both inside and outside the cell, while the hydrophobic tails form a nonpolar interior, preventing the passage of water-soluble molecules. This structure allows the cell membrane to maintain its integrity, regulate the transport of nutrients and waste products, and facilitate cell signaling processes.
| 5. Are all fatty acids and phospholipids the same? | |
No, not all fatty acids and phospholipids are the same. Fatty acids can vary in length, ranging from a few carbon atoms to over 20 carbon atoms. They can also differ in terms of saturation, with some fatty acids having double bonds in their hydrocarbon chain (unsaturated) and others lacking double bonds (saturated). Similarly, phospholipids can have different types of fatty acids attached to their glycerol backbone, resulting in variations in their properties and functions. The specific composition of fatty acids and phospholipids greatly influences their biological roles and impact on overall health.
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