The theory that explains how a substrate fits the active site of an enzyme is called the **lock and key model** or a modified version of it called the **induced fit model** . The lock and key model suggests that the active site of an enzyme is already in the correct shape for the substrate to bind to it like a key in a lock. The induced fit model suggests that the active site of an enzyme changes shape slightly as the substrate binds to it.

The lock and key model was first proposed by Emil Fischer in 1894. The induced fit model was proposed by Daniel Koshland in 1958. Both models are used to explain how enzymes work.

Enzymes are proteins that catalyze chemical reactions. They are essential for life because they speed up chemical reactions that would otherwise be too slow to sustain life. Enzymes are specific for their substrates, meaning that each enzyme can only catalyze one type of reaction.

I hope this helps you with your article. Here are some websites that discuss What Is The Name Given To The Theory That Explains How A Substrate Fits The Active Site Of An Enzyme?:
- https://www.bbc.co.uk/bitesize/guides/zwnstv4/revision/1
- https://en.wikibooks.org/wiki/Principles_of_Biochemistry/Enzymes
- https://www.britannica.com/science/induced-fit-theory
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_General_Biology_%28Boundless%29/06%3A_Metabolism/6.10%3A_Enzymes_-_Active_Site_and_Substrate_Specificity
- https://www.khanacademy.org/test-prep/mcat/biomolecules/enzyme-structure-and-function/v/the-induced-fit-model-of-enzyme-catalysis

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