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Insulin is a hormone that is produced by the pancreas and is released into the bloodstream to control the level of glucose in the blood. When the blood glucose concentration is too high, the pancreas secr...

The optimum temperature for enzymes in the body is around 37oC. If the body temperature falls below this temperature then enzymes will work too slowly for body process to occur fast enough the keep the ma...

The ribosome will bind to the mRNA at a specific binding site. The ribosome will then start to match tRNA anticodon sequences to the mRNA codon sequence. Each time a new tRNA comes into the ribosome, the ...

Firstly, capillaries are one cell thick and so this makes them very thin. This reduces the diffusion pathway between the capillary and other cells thus allowing efficient diffusion. Secondly, capillaries ...

Directional selection occurs when a phenotype at the extreme end of a distribution is favoured and so over time the distribution shifts in the direction of the favoured phenotype. An exam...