Enzymes

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

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Transport processes

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

Chlorophyll

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

What size are bacteria?

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

Meiosis

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

Animal and plant cells, cellular organelles

Eukaryotic cells contain a number of organelles.

Coenzyme A

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

ADP, ATP

ATP is the main source of energy for cells.

Viruses

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

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