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First the food is broken down into smaller chunks through the process of mastication. This increases the surface area of the food so enzyme activity is more efficient. The salivary gland secretes salivary am...

A competitive inhibitor has a similar shape to the substrate which an enzyme catalyses. Because of this they block the active site of the enzyme (the site on the enzyme that is complementary in shape to a sp...

Natural selection is all about the 'survival of the fittest' - the organisms which are best suited to their environment are most likely to survive and have offspring, leading to a change in allele frequency ...

Increase in temperature:Sweat produced from sweat glands increases energy transfer away from the body when it evaporates.Vasodilation of blood vessels close to the surface of the skin, which increases energy...

Enzymes are biological catalysts for lowering activation energy - the speed up the rate of reactions and all allow biological reactions involved in metabolic processes to take place at body temperature (37C)...