32 Questions
What term refers to the compound on which an enzyme acts?
Substrate
Where does catalysis occur in an enzyme?
Active site
What is the specific region where the substrate binds to an enzyme called?
Active site
What is the term for a complete, functional enzyme that is catalytically active and consists of an apoenzyme together with its cofactors?
Holoenzyme
What do enzymes lower in order to speed up reactions?
Activation energy
What is the name for the reactants that need to have a certain energy before they will react?
Substrates
What are cofactors that are small organic molecules called?
Coenzymes
Which family of enzymes assists in the breakdown of carbohydrates?
Amylases
What type of specificity refers to the enzyme acting on a particular type of chemical bond regardless of the rest of the molecular structure?
Linkage specificity
Which model of enzyme binding states that the active site is rigid in shape and does not change at all?
The lock-and-key model
What are examples of metal ions that act as cofactors?
$Co, Cu, and Zn$
Which type of enzymatic action involves joining two or more substrate molecules together?
Synthesis
What term is used for cofactors that are tightly bound to enzymes?
Prosthetic groups
What is the most common type of cofactor?
$B$ vitamins
Which enzyme works at a very acidic pH of 1.5?
$\alpha$-amylase
What does the induced-fit model state about the enzyme's shape?
The enzyme changes its shape for substrate binding.
What is the compound on which an enzyme acts called?
Substrate
What type of specificity refers to the enzyme acting on a particular type of chemical bond regardless of the rest of the molecular structure?
Group specificity
What model of enzyme binding states that the active site is rigid in shape and does not change at all?
Lock and key model
Which type of enzymatic action involves joining two or more substrate molecules together?
Ligase
What enzyme works at a very acidic pH of 1.5?
Pepsin
What is the term for cofactors that are tightly bound to enzymes?
Prosthetic groups
Which type of specificity refers to the enzyme acting on a particular steric or optical isomer?
Stereochemical specificity
Which model of enzyme binding states that the active site changes its shape to fit the substrate only after the substrate has been bound?
Induced-fit model
What term refers to the compound on which an enzyme acts?
Substrate
What is the specific region where the substrate binds to an enzyme called?
Active site
Which enzyme works at a very acidic pH of 1.5?
Pepsin
What is the term for cofactors that are tightly bound to enzymes?
Prosthetic groups
What do enzymes lower in order to speed up reactions?
Activation energy
What are examples of metal ions that act as cofactors?
Cu and Zn
Which type of enzymatic action involves breaking a single structure into smaller components or joining two or more substrate molecules together?
Ligation
What is the most common type of cofactor?
Metal ions
Explore the fundamental concepts of enzymes, substrates, and holoenzymes in biochemistry with Dr. Michael Mounir from Helwan University. Learn about the catalytic properties of enzymes and their essential role as biocatalysts in biological reactions.
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