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Cellular respiration

Breaking down glucose (food) without oxygen to provide available energy for the cells. The glucose reacts with oxygen to produce energy in the form of ATP with carbon dioxide and water as waste products

Digestive system

The organ system in the body which breaks down large insoluble food molecules into small soluble molecules which can be used by the body

Glossary

A list of often difficult or specialised words with their definitions.

Enzyme

Reusable protein molecules which act as biological catalysts, changing the rate of chemical reactions in the body without being affected themselves

Protein

A polymer made up of amino acids joined by peptide bonds. The amino acids present and the order in which they occur vary from one protein to another.

Cell

The basic unit from which all living organisms are built up, consisting of a cell membrane surrounding cytoplasm and a nucleus.

Enzymes

Enzymes are biological catalysts that speed up chemical reactions in living organisms. There are more than five hundred different enzymes in every cell of the body, each of them helping the cell, and the body as a whole, to work.

Some enzymes work outside the cells, for example the enzymes in the digestive system.

Enzymes are involved in all biological reactions, e.g. cellular respiration, photosynthesis and protein synthesis.  Without enzymes these vital reactions would be too slow for life to continue.

Image showing active site and substrates for an enzyme

How to use this site

There are a number of interactive features in this e-source:

  • A glossary of terms: any word with a glossary entry is highlighted like this. Moving the mouse over the highlighted word will show a definition of that word.
  • Quick questions: at the end of most pages or sections there is a question or set of quick questions to test your understanding.
  • Animations: most of the animations can be expanded to full screen size, ideal for showing on an interactive whiteboard. The animations will play all the way through or can be viewed one section at a time.
  • Downloads: Teachers can download individual diagrams, animations and other content from the Download Library area of the website. Terms and Conditions apply.