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Biochemistry Lecture 9: Enzymes and Catalysts

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Biochemistry Lecture 9: Enzymes and Catalysts

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Questions and Answers

What are enzymes?

Molecules that slow down biological reactions

Proteinic molecules that speed up biological reactions (correct)

Substrates that form the active site

Cofactors that increase the energy barrier for reactions

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

Apoenzyme

Holoenzyme

Product

Substrate (correct)

What is a holoenzyme?

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

A type of substrate-specific enzyme

An enzyme that does not require cofactors for catalytic activity

An inactive form of an enzyme

Where does the catalysis occur in enzymes?

In the substrate-specific region Signup and view all the answers

What does the activation energy represent?

The energy barrier that needs to be overcome for a reaction to occur Signup and view all the answers

Which type of cofactors are small organic molecules?

Coenzymes Signup and view all the answers

What is the most common type of cofactor?

Metal ions Signup and view all the answers

What is the main function of metal-activated enzymes?

Require metal ions as loosely bound cofactors Signup and view all the answers

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 Signup and view all the answers

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

Stereochemical specificity Signup and view all the answers