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Biology · Cell biology
The cell, the fundamental unit of all living beings, is a complex structure composed of different elements working in harmony. The plasma membrane: the protective envelope The plasma membrane is a semi-permeable barrier that delimits the cell and separates it from its environment. It consists of a double layer of phospholipids, in which various proteins are integrated. These proteins play a crucial role in the transport of substances across the membrane, cell communication and cell recognition. The cytoplasm: the internal environment The cytoplasm is the aqueous medium inside the cell. It contains many organelles, inclusions, and the cytosol. The cytosol is the liquid part of the cytoplasm, rich in enzymes and molecules necessary for the chemical reactions of the cell. The Core: The Control Center The nucleus is a characteristic organelle of eukaryotic cells. It contains the genetic information of the cell in the form of DNA, organized into chromosomes. The nucleus is surrounded by a nuclear envelope pierced by nuclear pores that allow the exchange of molecules between the nucleus and the cytoplasm. Organelles: specialized factories Organelles are specialized structures present in the cytoplasm. Each of them fulfills a specific function: Mitochondria: Nicknamed the "power plants" of the cell, they are the seat of cellular respiration, a process that produces the energy needed by the cell. The endoplasmic reticulum: A network of membranes involved in the synthesis of proteins and lipids. The Golgi apparatus: A set of flattened sacs that modify, package, and distribute proteins and lipids synthesized by the endoplasmic reticulum. Lysosomes: Small vesicles containing digestive enzymes that break down unnecessary or damaged molecules. The cytoskeleton: the skeleton of the cell The cytoskeleton is a network of protein filaments that gives the cell its shape, allows it to move, and organizes its organelles. It is made up of three types of filaments: microfilaments, intermediate filaments, and microtubules. The differences between prokaryotic and eukaryotic cells There are two main types of cells: prokaryotic cells (bacteria) and eukaryotic cells (animals, plants, fungi). Prokaryotic cells are simpler and do not have a nucleus or membrane-bound organelles. Eukaryotic cells, on the other hand, are more complex and have a nucleus and many organelles.
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
Spanish for all ages, for travel, studies or work! (Barcelona)
Florencia
Florencia welcomed us with different activities to find out about our level of Spanish. The lessons gave plenty of speaking opportunities. She took the time to analyse the mistakes made on Spanish exams to find ways of improving. After each lesson, Florencia gave us links for more online excersices and the notes to the lesson. She was friendly, accommodating, patient and non-judging - a great teacher
Review by JANA