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SSC Biology Chapter 2: Cells and Tissues (Hand Note)

1. The Cell (Introduction)

• Definition: The cell is the structural and functional unit of life. It is the smallest living entity capable of carrying out all life processes.
• Discovery: Robert Hooke (1665) observed a thin slice of cork under a self-made microscope and coined the term "Cell" (meaning little room in Latin).
• Cell Theory: Proposed by Schleiden and Schwann (1839).

  Table A: Prokaryotic vs. Eukaryotic Cells

  | Feature | Prokaryotic (e.g., Bacteria) | Eukaryotic (e.g., Human/Plant cell) | | :--- | :--- | :--- | | Nucleus | Absent (Nucleoid region) | Present (True nucleus with membrane) | | Organelles | Only ribosomes (70S) | Membrane-bound (Mitochondria, ER, Golgi) | | Size | 1-10 µm (Small) | 10-100 µm (Large) | | Cell division | Binary fission | Mitosis/Meiosis |

  Mitochondria: The Powerhouse of the Cell. This is where oxidative phosphorylation occurs to produce ATP. Pro tip: Draw the double-membrane structure with cristae for extra marks! ssc biology chapter 2 hand note exclusive

  Key differences often required for exam diagrams and short answers: SSC Biology Chapter 2: Cells and Tissues (Hand Note) 1

  We hope this article has been helpful in providing you with a comprehensive guide to SSC biology chapter 2. Happy studying! Definition: The cell is the structural and functional

  Differentiate: Expect questions like "Difference between Xylem and Phloem" or "Prokaryotic vs. Eukaryotic cells."