Biology teacher

  Prokaryotic Cells Explained for NEET | Easy Biology Notes Labeled diagram of a prokaryotic cell showing nucleoid, plasmids, cell wall, and mesosome structure for NEET revision. - Dr.Sanjaykumar Pawar  1. Prokaryotes have a cell wall surrounding the cell membrane except in Mycoplasma. Most prokaryotic cells (bacteria) have a cell wall outside the plasma membrane. The cell wall gives shape and protection . Exception: does not have a cell wall. NEET Point: Mycoplasma is the smallest living cell and lacks a cell wall. 2. The semi-fluid matrix filling the cell is the cytoplasm. The inside of the cell contains a jelly-like substance called cytoplasm . It contains enzymes, nutrients, ribosomes, and other materials. Many metabolic activities occur here. 3. There is no well-defined nucleus. Prokaryotic cells do not have a true nucleus. Their genetic material is not enclosed inside a nuclear membrane. NEET Point: Prokaryotes have a nucleoid , not a true nucle...

  Cell Theory Explained: Schleiden, Schwann and Virchow Notes for NEET Cell Theory and Overview of Cell showing plant cell, animal cell, nucleus, cytoplasm and membrane-bound organelles. Cell Theory & Overview of Cell (NEET Notes for Beginners) 1. Development of Cell Theory 🧑‍🔬 Matthias Schleiden (1838) German botanist. Studied plant tissues. Concluded that all plants are made up of cells . 🧑‍🔬 Theodor Schwann (1839) German zoologist. Studied animal cells. Observed a thin outer boundary in animal cells, now called the plasma membrane (cell membrane) . Found that cell wall is present only in plant cells . Concluded that animals and plants are composed of cells and cell products . 📖 Cell Theory by Schleiden and Schwann They proposed that: All living organisms are made up of cells. Cells are the basic structural units of life. 🧑‍🔬 Rudolf Virchow (1855) Explained how new cells are formed. Proposed: "Omnis Cellula e Cellula" → All cells arise...