Biochemistry Lecture 9: Enzymes and Holoenzyme

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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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