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Fatiha - Dellys, AlgeriaRecently active16€
16€plasma membrane: structure, function, properties
Structure of the plasma membrane The plasma membrane is mainly composed of: Phospholipids: These amphipathic molecules (having both a hydrophilic and a hydrophobic part) are organized into a double lipid layer. This structure gives the membrane its semi-permeable barrier property. Proteins: They are integrated into the lipid bilayer and perform various functions: transport of molecules, reception of signals, cellular recognition, etc. Carbohydrates: Linked to lipids (glycolipids) or proteins (glycoproteins), they play an important role in cell recognition and cellular interactions. Function of the plasma membrane Selective barrier: The plasma membrane allows the selective passage of certain molecules while preventing others. Transport: Membrane proteins provide passive (simple or facilitated diffusion) or active (pumps) transport of molecules across the membrane. Receiving signals: Membrane receptors allow the cell to detect and respond to signals from its environment. Cell recognition: Molecules present on the surface of the membrane allow cells to recognize and interact with each other. Maintenance of homeostasis: The plasma membrane helps maintain a stable intracellular environment by regulating exchanges between the cell and its environment. Properties of the plasma membrane Fluidity: The plasma membrane is not a rigid structure but rather fluid, which allows it to deform and change shape. Asymmetry: The two faces of the plasma membrane have different compositions, which gives the membrane polarity. Plasma membrane models Fluid mosaic model: This model, the most accepted, describes the membrane as a constantly changing mosaic of lipids and proteins.
Cell biology
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CHEMISTRY and BIOLOGY (Cambridge IGCSE / O-Levels / Person Edexcel / Oxford AQA Int, GCSE / AS & A-LEVELS / IB Diploma) (Tokyo)
Benson
After my first lesson with Benson, i have felt more confidence in my skills with chemistry than i have in many years. Where I previously felt very subconscious and unable to answer questions, i have now been able to answer difficult IB exams questions with ease. Benson provided me a safe and comfortable environment which has left me excited for my next class at school to show what i have learned with a fresh confidence! I highly recommend this tutor to anyone who struggles with confidence in both themselves and their subjects.
Review by TIA
LEARN OR IMPROVE YOUR SPANISH WITH A NATIVE SPANISH TEACHER (Palma de Mallorca)
Carlos
Carlos is an amazing teacher! I have learned more studying with him in a few months then I have learned in a year with other teachers. He is patient, knowledgeable and organized. We have good conversations and he really knows how to activate the language and give confidence to his students. For more basic students like myself it's very useful that he can speak other languages so well, although we use mostly Spanish in our lessons. He is simply the best! I highly recommend Carlos as a teacher!
Review by CYNTHIA
Italian lessons. Italian lessons online or in person. (Rome)
Emma
Emma is an amazing teacher. My husband and I have different learning styles and Emma is able to work with both. She is very knowledgeable, engaging, and enthusiastic. We thoroughly enjoy her company. We can only offer our highest recommendation - if you want to learn Italian, study with Emma!
Review by GRACE

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