Learn about and revise vectors and how they can be can be added, subtracted and multiplied by a scalar with this Bitesize GCSE Maths Edexcel guide.

Learn and revise about vectors and how they can be can be added, subtracted and multiplied by a scalar with this BBC Bitesize GCSE Maths AQA study guide.

Plasmids that are used experimentally for these purposes are called vectors. Researchers can insert DNA fragments or genes into a plasmid vector, creating a so-called recombinant plasmid.