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Cell — The Building Block of Life
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2.1 How to Study Cells
Seeing the unseen
Limit of resolution
Eye sees down to 0.1 mm.
Light & electron microscope
Tools to magnify cells.
2.2 Structure of a Cell
The cell's coverings
Cell membrane
Selectively permeable boundary.
Cell wall
Rigid layer in plants, fungi, bacteria.
Osmosis & diffusion
How water and particles move.
2.3 The Cell Interior
Inside the cell
Nucleus & organelles
Each part has a job.
Prokaryotic vs eukaryotic
No true nucleus vs true nucleus.
2.4 Growth and Division
Making new cells
Mitosis
Two identical cells.
Meiosis
Four cells, half chromosomes.
2.5 Cell Theory
The unifying idea
Three scientists
Schleiden, Schwann, Virchow.
Contact inhibition & cancer
Control lost in tumours.
