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An enzyme is a protein that act as a biologcal catalyst, meaning that they will activate a biological reaction. 

Enzymes are very specific and will work with a specific substrate. You can...

Red blood cells have a biconcave disk shape, meaning that it increases their surface area and allows for more rapid diffusion of oxygen into and out of the cell.

Red blood ...

Biology GCSE like any other requires a basic level of understanding, but in addition it requires you to use scientific terminology. By using specific words or descriptions in your answers you make it easi...

They can engulf and ingest pathogens; this is essentially the white blood 'eats' the pathogen. They secrete (release) antitoxins which counteract the toxins released by pathogens. The toxins they release ...

The lock and key model:

Only substrates of a specific shape that is complementary to the active site of an enzyme can fit into the active site, in a way that is analagous to a key fitting...