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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 ...

Atmospheric pressure is an expression for the force exerted on a surface (in this case the water surface) per unit area caused by air particle collisions on the surface. In a cup of water, there is a unif...

Although red can be a purely aesthetic description, we must remember that this is a fictive space created by an author to evoke particular emotions, which help us respond to the story they're trying to te...

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...

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...