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Enzymes act as biological catalysts for reaction that occur in organisms such as animals and plants. This means that they help to speed up reactions, or allow them to take place at lower ...

Part 1) - the retina It contains light sensitive cells - the rods/cones
  Part 2) the vitreous humour It maintains the shape of the eye

This is an easy one if you just remember two simple facts.

A binds to T and

C binds to G

Since we have the bases A, C, G to pair with now we know, the answer must be.....

When a cell divides, the number of chromosomes in that cell does not change. So if a cell had 40 chromosomes in it before it divided, it would still have 40 chromosomes in it after it had divided.

Indicator species are organisms whos presence or absense may indicate something about the environement. For example, an increase in organisms that are not dependant on oxygen to survive (also known as ana...