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This is the force that resists movement between two surfaces which are in contact.

Oxygen is required by the electron transport chain to operate. Many biochemical pathways (for example Kreb’s cycle and ß-fatty oxidation) extract electrons from biomolecules and transfer them to electron car...

The smallest living unit is the CELL and is organised in different ways according to its function. Although they are a bit different, there are some common features. For the animal cell, these are: a nucleus...

Osmosis is the movement of water from an area of high concentration to an area of low concentration until an equilibrium is reached. It occurs in cells in the body.

This is because of the strong attractive electrostatic forces holding the oppositely charged ions together and a large number of ionic bonds in the crystal lattice. These require a lot of thermal energy to o...