The plasma membrane is the gatekeeper of the cell, a selective barrier that separates the internal environment from the outside world. It's primarily composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. This intricate structure regulates the movement of substances in and out of the cell, playing a crucial role in maintaining cellular homeostasis and enabling cell communication. Understanding the plasma membrane is fundamental to grasping how cells function and interact within living organisms.
Match the terms with their correct definitions:
| Term | Definition |
|---|---|
| 1. Phospholipid | A. A transport process where the cell engulfs large particles or whole cells. |
| 2. Integral Protein | B. A type of passive transport that requires the assistance of membrane proteins. |
| 3. Facilitated Diffusion | C. A lipid molecule with a hydrophilic head and hydrophobic tail, forming the basic structure of the membrane. |
| 4. Endocytosis | D. A sterol lipid that is a component of animal cell membranes and functions to maintain membrane integrity. |
| 5. Cholesterol | E. A protein that is permanently embedded within the plasma membrane. |
Complete the following paragraph with the correct terms:
The plasma membrane is selectively permeable, meaning it allows some substances to cross more easily than others. Small, nonpolar molecules can pass through the membrane via simple __________. Charged ions require __________ proteins to cross. The movement of water across the membrane is called __________, which is a type of passive transport. Active transport requires energy in the form of __________.
Explain how the fluid mosaic model describes the structure and function of the plasma membrane.
Please log in to post your answer.
Log InEarn 2 Points for answering. If your answer is selected as the best, you'll get +20 Points! 🚀