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diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they pass...

risk factor is something which increases your chance of developing a particular disease. risk factor of coronory heart disease is diet due to the atheroma developed from the fatty material deposited in the a...

eutrophication is whereby excess feriliser from farmland has run off into areas of water such as lakes or rivers. algae growth is promoted due to the rise in phosphates. in turn the remaining oxygen in the w...

DNA is unzipped by a helicase, the gene to be encoded is transcribed to mRNA by the enzyme RNA polymerase, in mRNA the thymine base is substituted by uracil. The mRNA leave the nucleus via a nuclear pore and...

Synaptic transmission, whether chemical or electrical, results in a change in membrane potential of the post-synaptic cell. If an excitatory synapse is activated, this results in a depolarization of the post...