Biochemistry Lecture 9: Enzymes and Catalysts

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What are enzymes?

Proteinic molecules that speed up biological reactions

What is the compound on which an enzyme acts known as?


What is a holoenzyme?

A complete, functional enzyme consisting of an apoenzyme and a cofactor

Where does the catalysis occur in enzymes?

In the substrate-specific region

What does the activation energy represent?

The energy barrier that needs to be overcome for a reaction to occur

Which type of cofactors are small organic molecules?


What is the most common type of cofactor?

Metal ions

What is the main function of metal-activated enzymes?

Require metal ions as loosely bound cofactors

Which model of enzyme binding states that the active site is complementary in shape to the substrate and does not change at all?

Lock-and-Key Model

What type of specificity does the enzyme exhibit if it acts on a particular steric or optical isomer?

Stereochemical specificity

Learn about enzymes, proteinic molecules that act as catalysts to speed up biological reactions. Understand the structure and function of enzymes, including the substrate binding region and holoenzyme composition.

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