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Enzymes speed up chemical reactions by lowering the activation energy, which provides an alternative pathway, making it easier to reach the transition state. Enzymes are denatured by changes in temperatur...

Examples of living organisms involved in the cycling of carbon include plants, animals and microorganisms. Plants, for instance, take part in photosynthesis - a process through which carbon dioxide is tak...

Neurotransmitter is released from presynaptic neurone into the synaptic cleftDiffuses across the synapse Neurotransmitter binds onto postsynaptic membrane

Sympatric speciation occurs when populations (groups) of a species that share the same habitat become reproductively isolated from each other this can be caused by numerous phenomenon. The most common is ...

The role of the sperm cell is to fertilise the egg. It is adapted to fulfill this role in four main ways. Firstly it has a tail to help it travel to the egg. Secondly it contains the nucleus in the head t...