cells
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Life itself builds upon biological molecules: Carbohydrates, proteins and lipids (fats).
Cells are the basic unit of all lifeforms. There are many different types of cells with many different functions.
Cells are made up of many different structures with very specific functions.
The nature of cell membranes and transport processes allow the cell to control the movement of substances in and out, for life to function.
Structure of the Cell Membrane
Diffusion
The Rate of Diffusion
Surface Area to Volume Ratio
Maximising Diffusion in Living Things
Osmosis
Measuring Osmosis
Active Transport
Respiration inside cells is a chemical reaction that occur all the time to transfer energy from nutrients into Adenosine Triphosphate (ATP).
Microscopes have allowed us to magnify the view of very small cell structures that we otherwise would not be able to see.
Tiny Units
Tiny Units in Standard Form
Microscopes and Magnification
Types of Data in Microscopy
Types of Microscopes
Stem cells allow for organisms to grow and develop cells of different types.
What Are Stem Cells?
What Do Stem Cells Do?
Stem Cells in Therapy
Stem Cells for Plant Cloning
Ethics of Stem Cells
Enzymes are typically proteins that speed up chemical reactions within cells.
What Are Enzymes?
Enzyme Structure
Enzymatic Action
The Rate of Enzyme Activity
Influencing Enzyme Activity
Cells divide in order to grow and develop, which is part of the cell cycle.