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Enzymes are biological catalysts. They speed up reactions although they are not changed in the reaction. Enzymes are proteins, and therefore are folded chains of amino acids with a specific shape. This...

When a course of antibiotics is taken, non-resistant bacteria should be killed. However, genetic mutations can lead to certain individuals becoming resistant to a particular antibiotic. The mutated gen...

Photosynthesis is the process by which green plants and some bacteria absorb light energy from the sun using chlorophyll (a pigment in the leaves of plants responsible for the green colour) which leads...

Break this question down into the four stages: primary, secondary, tertiary and quarternary and for each one describe the structure and what the non-covelant interactions are that hold the protein toge...

A reflex arc describes what controls a reflex reaction in humans. When something happens to an organism that needs a quick response a reflex action occurs. It allows the action to be 'unthinking'. A st...