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To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.

An enzyme is a globular protein that acts as a biological catalyst.  They work by reducing the activation energy of chemical reactions, which increases the rate of reactions.

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Mitosis and meiosis refer to the way cells reproduce. 
Mitosis sees the cell divide in two, forming two genetically identical diploid cells. The reproduction of cells means mitosis is used by the bod...

Plants that live in these areas need to minimise the rate at which they transpire in order to preserve as much water as possible. 

One way they do this is by reducing their surface area:v...

There are 4 levels you use to describe protein structure. 

Primary Structure - This is the simplest structure of a protein. It is essentially the sequence of amino acids that form a prote...