Class 9 Exam > Class 9 Videos > Biology for Class 9 > Cell Membrane
Cell Membrane Video Lecture | Biology for Class 9
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FAQs on Cell Membrane Video Lecture - Biology for Class 9
| 1. What is the cell membrane? |  |
Ans. The cell membrane, also known as the plasma membrane, is a thin, flexible barrier that surrounds and encloses the contents of a cell. It separates the cytoplasm (internal environment) of the cell from the external environment and regulates the movement of substances in and out of the cell.
| 2. What is the composition of the cell membrane? | |
Ans. The cell membrane is mainly composed of phospholipids arranged in a double layer called the phospholipid bilayer. Each phospholipid molecule consists of a hydrophilic (water-loving) head and two hydrophobic (water-repelling) tails. Proteins, cholesterol, and carbohydrates are also present in the cell membrane, contributing to its structure and function.
| 3. How does the cell membrane regulate the movement of substances? | |
Ans. The cell membrane is selectively permeable, meaning it allows certain substances to pass through while restricting others. Small, non-polar molecules like oxygen and carbon dioxide can pass through the lipid bilayer by simple diffusion. Larger molecules, ions, and polar molecules require specific transport proteins to facilitate their movement across the membrane.
| 4. What is the role of proteins in the cell membrane? | |
Ans. Proteins in the cell membrane serve various functions. Some proteins act as channels or transporters, allowing specific molecules or ions to move across the membrane. Others serve as receptors, which bind to specific molecules and initiate cellular responses. Proteins also play a role in cell adhesion, cell signaling, and enzymatic activities within the cell membrane.
| 5. How does the cell membrane maintain the cell's internal environment? | |
Ans. The cell membrane helps maintain the cell's internal environment by regulating the transport of substances in and out of the cell. It prevents the entry of harmful substances and controls the exit of waste products. The cell membrane also maintains the concentration of ions and molecules necessary for cellular processes through active transport and selective permeability.
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Dec 22, 2024 Last updated |
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