Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

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Bacteria (advanced)

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

The structure of prokaryotic and eukaryotic cells

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

Enzymes

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

What size are bacteria?

This lesson presents the structure and classification of bacteria and the role they play...

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.

Meiosis

Our gametes are haploid cells produced from diploid cells by meiosis, a special type of...

Viruses

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

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