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Cell biology lessons in Calcutta

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Biology · Cell biology
Cell Biology is a fundamental topic in both the IGCSE and CIE AS/A Level Biology curricula. It focuses on the structure, function, and processesof cells, the basic units of life. Here's a breakdown of the content at each level: --- IGCSE Biology (0610/0970) At the IGCSE level, cell biology introduces foundational concepts about cells, their structures, and processes: 1. Cell Structure and Organization -The Cell as the Basic Unit of Life: - Differences between plant and animal cells. - Identification and functions of cell structures (organelles): - Cell membrane: Controls the movement of substances. - Cytoplasm: Site of metabolic reactions. - Nucleus: Contains DNA and controls cell activities. - Mitochondria: Site of aerobic respiration. - Chloroplasts (plant cells): Site of photosynthesis. - Vacuole: Contains cell sap (large in plants). - Cell wall(plant cells): Provides structure and support. - Use of a light microscope to observe cells. 2. Specialization of Cells. - Specialized cells and their adaptations: - Red blood cells, nerve cells, root hair cells, ciliated cells, sperm cells, etc. - Understanding tissues, organs, and organ systems. 3. Movement of Substances - Processes for the movement of substances across membranes: - Diffusion: Movement of particles from high to low concentration. - Osmosis: Movement of water through a selectively permeable membrane. - Active transport: Movement of substances against a concentration gradient using energy. 4. Enzymes - Enzymes as biological catalysts and their role in cell processes. - Factors affecting enzyme activity: temperature, pH, substrate concentration. CIE AS and A Level Biology (9700) At the AS/A Level, cell biology expands significantly, focusing on advanced concepts, cellular processes, and microscopy: 1. Cell Structure - Prokaryotic vs. Eukaryotic Cells: - Prokaryotes (bacteria) lack a nucleus and membrane-bound organelles. - Eukaryotes (plants, animals, fungi, and protists) have a nucleus and organelles. - Structure and Function of Organelles: - Nucleus: Contains chromatin and nucleolus. - Mitochondria: Site of ATP production (aerobic respiration). - Ribosomes: Site of protein synthesis. - Endoplasmic Reticulum (ER): - Rough ER: Protein transport and modification. - Smooth ER: Lipid synthesis. - Golgi Apparatus: Modification, packaging, and transport of proteins. - Lysosomes: Contain enzymes for digestion. - Chloroplasts (plants): Site of photosynthesis. - Cell membrane: Phospholipid bilayer and fluid mosaic model. - Cell wall: Found in plants, fungi, and prokaryotes. - Microscopy: - Light microscopes and electron microscopes (TEM and SEM). - Calculations: magnification and actual size 2. Cell Membranes and Transport - Structure of the phospholipid bilayer (fluid mosaic model). - Functions of proteins in the membrane: carriers, channels, and receptors. - Transport mechanisms: - Diffusion, facilitated diffusion, osmosis, and active transport. - Endocytosis and exocytosis (bulk transport). 3. Cell Division - Mitosis: - Stages of mitosis: prophase, metaphase, anaphase, and telophase. - Importance of mitosis for growth, repair, and asexual reproduction. - Meiosis: -Production of gametes. - Significance in genetic variation through crossing over and independent assortment. 4. Cell Communication and Enzymes - Role of enzymes in metabolism (anabolic and catabolic reactions). - Cell signaling: How cells communicate via hormones and receptors. 5. Viruses - Virus structure and replication as non-cellular entities (e.g., HIV and influenza). - Summary - At the IGCSE level, cell biology focuses on basic cell structures, specialized cells, diffusion, osmosis, and enzyme functions. - At the AS/A Level, it covers advanced topics such as organelle structure, cell division, membrane transport, microscopy, and the differences between prokaryotic and eukaryotic cells.
Cell biology
Trusted teacher: Hey students!!. I am Dr. Soha, a Highly qualified and experienced tutor who successfully teaches the following subjects - Cell biology, - Molecular biology, - Genetics, - Microbiology, - Biochemistry, and much more along with tests and exam preparation in an easier way. If you are looking for a committed and qualified tutor who can assist you in achieving your academic and professional objectives.... Look no further. Let's get started on your path to success!! I have extensive knowledge in enzymology, stem cell biology, molecular biology, genetics, and stem cell therapy. I am always excited to share my knowledge with students and assist them in reaching their full potential. I am confident that my knowledge and experience qualify me for teaching on an online platform, and I am willing to give more information if necessary. If you are having trouble with your studies or understanding ideas for your tests, you can contact me. I have a variety of resources available, including medical books, videos, slides, and more. I am committed to assisting students in comprehending complicated scientific concepts and ideas in an entertaining and accessible manner. I can help students grasp difficult subjects, and I am sure that my knowledge and expertise will be a great addition to your online learning environment. Furthermore, I offer guidance on optimizing exam performance through self-study techniques. My goals are to build strength, self-confidence, and creativity in my students. The lectures I will provide will be advantageous in all aspects according to students' needs. I assign home tasks and provide periodic progress reports. I can assist you with increasing your critical thinking and problem-solving abilities, understanding difficult medical ideas, and exam preparation. I will provide Notes and Helping material if needed.
Cell biology · Molecular biology · Microbiology
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
Cell biology · Earth and life sciences · Social studies
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Learn Biology, Chemistry, and Science, Cambridge (IGCSE/GCSE), O/A LEVEL, Medical entrance exam preparation
Dr. Soha
Dr. Soha is a truly amazing and nice teacher. She always makes sure her students understand the concepts in depth and cares a lot about their learning experience! I strongly recommend her services to everyone! :))
Review by FLORENTINA
Science, Chemistry, English, Biology Test preparation lessons in line with school curricula
Hagar
Amazing teacher, teaching well and good explanation.
Review by LEEN
Chemistry, Biology, Biochemistry classes science subjects (London)
Abrar
He was really nice and explained well
Review by MIRA