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For non-polar small molecules simple diffusion down a concentration gradient through the phospholipid bilayer is possible as it is soluble in the hydrophobic fatty acid tails of the membrane. An example of t...

Within a population of a species there will be variation between individuals. These variations arise because of mutations causing differences in alleles and phenotypes. Some individuals will have an allele w...

The Loop of Henle is an important part of the kidney nephron in forming concentrated urine. It is a long loop, which forms something known as a hairpin countercurrent mechanism. It is called countercurrent b...

A synapse consists of a presynaptic and a postsynaptic neuron. Information passes across when an electrical signal reaches the end of the presynaptic neuron, causing the release of molecules called neurotran...

The induced fit model is a way of explaining how an enzyme can aid in a biological reaction. When the active site of an enzyme comes into contact with the substrate, the enzyme will attempt to mould itself a...