Biochemistry (1) Lecture 9: Enzymes

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What is the specific region on an enzyme where the substrate binds and catalysis occurs?

Active site

What is the complete, functional enzyme that is catalytically active and consists of an apoenzyme together with its cofactors called?

Holoenzyme

What is the compound on which an enzyme acts called?

Substrate

What do enzymes do to the energy barrier required for a reaction to occur?

Lower it

What are small organic molecules that act as cofactors called?

Coenzymes

What is the term for the energy required by all reactants (substrates) before they will react?

Activation energy

Which type of specificity refers to an enzyme acting on a particular steric or optical isomer?

Stereochemical specificity

What type of model explains that the active site of the unbound enzyme is complementary in shape to the substrate and does not change at all?

The lock-and-key model

In enzymatic actions, what are cofactors that are tightly bound called?

Prosthetic groups

Which family of enzymes assists in the breakdown of lipids?

Lipases

What is the term for the energy required by all reactants (substrates) before they will react?

Activation energy

Which family of enzymes assists in the breakdown of lipids?

Lipases

What are small organic molecules that act as cofactors called?

Coenzymes

What type of specificity refers to an enzyme acting on a particular steric or optical isomer?

Stereochemical specificity

What is the specific region on an enzyme where the substrate binds and catalysis occurs?

Active site

Which type of enzyme specificity refers to the enzyme acting on molecules with specific functional groups?

Group specificity

What is the term for enzymes that require metal ions as loosely bound cofactors?

Metal-activated enzymes

Which model of enzyme binding explains that the enzyme changes its shape for substrate binding?

Induced-fit model

What type of molecules are cofactors that are small organic molecules called?

Coenzymes

Which family of enzymes is used to break protein down into peptides in the stomach?

Pepsin

This quiz covers the basics of enzymes in biochemistry, including their role as catalysts, substrates, and holoenzymes. Presented by Dr. Michael Mounir from the Faculty of Science at Helwan University.

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