20 Questions
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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