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An enzyme is a biological catalyst which can speed up the rate of chemical reactions, it is also a protein that can be reused.
The lock and key model explains how an enzyme works to catalyse reactio...

Osmosis is a term used to describe the movement of water molecules from a high water potential to a low water potential. Diffusion is similar to this, however it is used to describe the movement of molecu...

The main bits of an animal cell are as follows: A nucleus - this is where the genetic material is kept for cell replication and repair Cytoplasm - this is the bit in between the other things in the cell -...

This is a common topic to come up in exams, often worth many marks. Eutrophication is an ecological process which often occurs when humans are irresponsible with waste products that can end up in bodies o...

This is the net passive movement of molecules down the concentration gradient from an area of high concentration to an area of lower concentration, through ...