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An enzyme is a protein which acts as a biological catalyst, to speed up reactions. It has an active site which is a very specific shape to allow it to bond to a particular reagent and catalyse a specific ...

Explanation of keys words first; a gene is a section of DNA that codes for a particular characteristic such as eye colour. An allele is a version of a gene (e.g. an allele for the eye colour gene could co...

The human heart has four chambers, the right atrium, the right ventricle, the left atrium and the left ventricle. The right and left sides are completely seperated by the septum, this is so that the oxgen...

Marram grass is an example of a plant adapted to its environment, as it lives on sand dunes where the environment is harsh. The sand its roots are in means water will drain away and its closeness to the s...

Glucose is a product of carbohydrate digestion, the absorption of which into the blood stream involves two main stages: 1) Diffusion into the blood: When carbohydrates are first broken down, there's a hig...