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Enzymes are proteins. They are biological catalysts, meaning they increase the rate of reaction without being used up or changed. Different enzymes have different optimum temperatures and pHs, depending o...

The imperfect tense is a past tense. There are three reasons why we might use the imperfect tense and these can be remembered as: habitual, incomplete and descriptive. What does 'habitual' mean? Habitual ...

A 'non-specific' defence system means that its response is the same for every invader (pathogen). In the human body this includes:

Skin- a physical barrier between the outside worl...

38% and 38/100.

There are two types of 2D Computer graphic, bitmap and vector. A bitmap is a picture made up of lots of tiny dots called pixels and can be edited in Adobe Photoshop. Vector is when the picture is joined o...