Enzymes

Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.

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Mitosis

Mitosis is the process by which a eukaryotic cell divides into two cells and the number...

Bacteria (advanced)

Bacteria are unicellular organisms that have no nuclei and are a few micrometres in length

Viruses

Viruses consist of protein and DNA or RNA, they reprogram infected cells to produce more...

Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy,...

Animal and plant cells, cellular organelles

Eukaryotic cells contain a number of organelles.

Transport processes

This animation explains active and passive transport processes occurring through cell...

Coenzyme A

An acyl-carrier coenzyme taking part in both anabolic and catabolic processes.

The structure of prokaryotic and eukaryotic cells

There are two basic cell types: prokaryotic and eukaryotic cells.

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