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18 Questions

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Metal Ions in Catalysis

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Questions and Answers

What is the role of metal ions in enzyme catalysis for orientation of substrates?

Shielding positive charges

Electrostatically stabilizing negative charges

Activating the enzyme

Mediating oxidation-reduction reactions (correct)

What is the function of a coenzyme in enzyme catalysis?

Stabilize the enzyme's active site

Directly participate in the reaction mechanism (correct)

Assist in substrate binding

Provide structural stability to the enzyme

Which term describes an enzyme without its bound cofactor?

Coenzyme

Holoenzyme

Cofactorase

Apoenzyme (correct)

In enzyme catalysis, how do metal ions act similarly to H+?

By stabilizing negative charges Signup and view all the answers

What is the term for enzymes that require a metal ion cofactor for activity?

Metaloenzymes Signup and view all the answers

How do enzymes exhibit specificity towards substrates?

Through charge complementarity Signup and view all the answers

What did Daniel Koshland modify in the 'lock and key' model of enzyme-substrate interaction?

The amino acid side chains making up the active site Signup and view all the answers

Which model explains both enzyme specificity and the stabilization of the transition state?

Induced fit model Signup and view all the answers

In chiral reactions, enzymes are typically:

Stereospecific Signup and view all the answers

What concept from transition state theory helps explain how enzymes catalyze chemical reactions?

Reaction Coordinate Signup and view all the answers

Which statement is true regarding metal ion cofactors in enzymes?

They can alter the shape of the active site Signup and view all the answers

What role do coenzymes play in enzyme-catalyzed reactions?

Facilitate electron transfer reactions Signup and view all the answers

What region of an enzyme contains the catalytic residues and binds the substrate to carry out the reaction?

Active site Signup and view all the answers

Which type of molecules can act as cofactors for enzymes?

Metal ions and organic molecules Signup and view all the answers

What is the role of coenzymes in enzymatic reactions?

To transiently associate with enzymes Signup and view all the answers

Which type of enzymes require metal ions for their catalytic activity?

Metalloenzymes Signup and view all the answers

What is the function of metal ion cofactors in metalloenzymes?

Act as essential components for catalysis Signup and view all the answers

Which type of cofactors are most commonly associated with vitamins?

Coenzymes Signup and view all the answers