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Can someone explain substrate concentration?

I was wondering if anybody could explain in more detail what a "substrate concentration" is and how it relates to enzymes in particular? Thank you

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First, I think we need to start with a few definitions:

An ENZYME is a biological catalyst that speeds up the rate of biological reactions by lowering the activation energy required for them to proceed.

In any reaction, you have a SUBSTRATE (or substrates) and a PRODUCT (or products). The SUBSTRATE is like the raw material that gets transformed, somehow, into the end product.

Onto substrate concentration:
Enzymes are SUBSTRATE-SPECIFIC, which means that a specific enzyme can usually only catalyze the conversion of one specific substrate into a product. The rate of an enzymatic reaction is limited by substrate concentration, meaning how much of that specific enzymes specific substrate ...

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