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For natural selection to occur, four conditions must exist. The first is that the population reprodces enough for there to be competition for resouces and survival between the members. The second is that par...

In myelinated axons, the myelin sheath that surround the membrane prevents action potentials forming, hence depolarisation only occurs at the nodes of Ranvier (breaks in the sheath, exposing the membrane, at...

All enzymes have an optimum temperature, at which rate of reaction/catalysis is fastest. Any deviation from the optimum temperature will slow down rate of reaction. Like most chemical reactions, an increase ...

Photosynthesis is the process by which plants make energy. Plants use carbon dioxide from the atmosphere, water from the soil and light which acts as a "catalyst" to make usable energy in the form ...

The key distinguishing feature between saturated and unsaturated fatty acids is the presence of a double bond. This double bond, present only in unsaturated fatty acids, will mean there are less hydrogen ato...