Enzyme Catalysis and Reaction Rates Quiz

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Which type of enzyme catalyzes redox reactions?

Lyases

Hydrolases

Transferases

Oxidoreductases (correct)

What is the function of amylase?

Catalyzes oxidation

Digests starch (correct)

Transfers functional groups

Catalyzes hydrolysis

Which enzyme catalyzes the digestion of lactose?

Lipase

Oxidase

Lactase (correct)

Pepsin

What is the main function of transferases?

Transfer of functional group between 2 substrates Signup and view all the answers

Which subclass of isomerases involves the alteration of the spatial arrangement of atoms in a molecule?

Mutases Signup and view all the answers

What is the function of ligases in terms of molecule combination?

Combine molecules through aid of ATP Signup and view all the answers

What is the main characteristic of enzymes as catalysts?

True catalyst and do not alter equilibrium constant Signup and view all the answers

What is the role of cofactors in enzyme structure?

Small molecules required for enzymatic activity Signup and view all the answers

How do enzymes increase reaction rates?

By decreasing the activation energy Signup and view all the answers

'Lock-and-Key' model proposed by Emil Fischer implies that:

Enzyme and substrate interact with specific matching shapes at the active site Signup and view all the answers

What is the main function of induced-fit model in enzyme-substrate interaction?

Enzymes are flexible and their shapes can be modified by binding with a substrate Signup and view all the answers

What does acid/base catalysis involve?

Proton (H+) transfer, which is common in biochemical reactions Signup and view all the answers

What is demonstrated in the reaction between an ester and carboxylate group?

Entropy reduction by restraining motion of molecules for reaction to proceed Signup and view all the answers

What does metal ion catalysis involve?

Bound metal cofactor orienting substrate for reaction or stabilizing charged transition states Signup and view all the answers

What does binding energy (GB) facilitate in enzyme-substrate interaction?

Facilitates formation of transition state by reducing activation energy Signup and view all the answers

Enzymes can alter the equilibrium constant of a reaction.

False Signup and view all the answers

Ligases are a subclass of isomerases.

False Signup and view all the answers

Enzymes are not highly regulated and their rate of activity cannot adjust to the condition of the cell.

False Signup and view all the answers

Enzymes are not highly specific and do not selectively recognize proper substrate over other molecules.

False Signup and view all the answers

All enzymes are made up of simple proteins only.

False Signup and view all the answers

Prosthetic groups are not required for the biological function of enzymes.

False Signup and view all the answers

Enzymes increase reaction rate by increasing the activation energy.

False Signup and view all the answers

The lock-and-key model implies that the enzyme and the substrate interact by means of short-range forces that require close contact.

True Signup and view all the answers

The induced-fit model states that enzymes are inflexible and the shapes of active sites cannot be modified by binding with a substrate.

False Signup and view all the answers

Entropy reduction is not demonstrated in the reaction between an ester and carboxylate group.

False Signup and view all the answers

Acid/base catalysis does not involve proton transfer in biochemical reactions.

False Signup and view all the answers

Metal ion catalysis does not involve the orientation of the substrate for the reaction or stabilization of charged transition states.

False Signup and view all the answers

Enzymes are biological catalysts that increase the rate of reaction by factors more than a million times without being used up.

True Signup and view all the answers

Enzymes lower the activation energy by providing an alternate pathway for chemical reactions.

True Signup and view all the answers

Enzymes measure the amount of product formed per unit time to determine reaction rates.

True Signup and view all the answers

Enzyme names ending in -ase always identify the reacting substance.

False Signup and view all the answers

Enzyme names ending in -ase always describe the function of the enzyme.

True Signup and view all the answers

Common names of digestion enzymes often end in -in.

True Signup and view all the answers

Oxidoreductases catalyze redox reactions and have subclasses such as oxidases and dehydrogenases.

True Signup and view all the answers

Transferases involve the transfer of functional groups between two substrates.

True Signup and view all the answers

Hydrolases catalyze hydrolysis or addition of water.

True Signup and view all the answers

Lyases remove atoms to form a double bond or add atoms to a double bond.

True Signup and view all the answers

In enzyme nomenclature, the name 'pepsin' identifies an enzyme that digests starch.

False Signup and view all the answers

In enzyme classification, lipases belong to the subclass of lyases.

False Signup and view all the answers

Match the enzyme classification with its description:

Oxidoreductases = Catalyze redox reactions Transferases = Transfer of functional group between 2 substrates Hydrolases = Hydrolysis/addition of water Lyases = Add atoms to a double bond or remove atoms to form a double bond Signup and view all the answers

Match the enzyme nomenclature with its example:

Amaylase = Digests starch Lactase = Digests lactose Oxidase = Catalyzes oxidation Hydrolase = Catalyzes hydrolysis Signup and view all the answers

Match the enzyme common names with their function:

Pepsin = Digestion enzyme Trypsin = Digestion enzyme Oxidase = Catalyzes oxidation Hydrolase = Catalyzes hydrolysis Signup and view all the answers

Match the subclass of lyases with its function:

Dehydrases = Add atoms to a double bond or remove atoms to form a double bond Decarboxylases = Add atoms to a double bond or remove atoms to form a double bond Deaminase = Add atoms to a double bond or remove atoms to form a double bond Signup and view all the answers

Match the subclass of isomerases with their primary function:

Racemases = Alteration of the spatial arrangement of atoms in a molecule Mutases = Transfer of a functional group within a molecule Epimerases = Conversion of a molecule into its epimer Signup and view all the answers

Match the enzyme property with its characteristic:

True catalyst and do not alter equilibrium constant = Enzymes are highly regulated and can readily adjust to the condition of the cell Highly specific = Enzymes are highly regulated and can readily adjust to the condition of the cell Highly regulated = Enzymes do not alter the equilibrium constant of a reaction Signup and view all the answers

Match the enzyme structure component with its description:

Cofactors = Enzymes containing cofactors or coenzymes for their biological function Prosthetic groups = Tightly bound, specific nonpolypeptide units required for the biological function of enzymes Simple proteins only = Enzymes made up of simple proteins without any cofactors or prosthetic groups Signup and view all the answers

Match the model of enzyme-substrate interaction with its description:

Lock-and-Key Model = Enzyme and substrate interact by means of short-range forces that require close contact Induced-Fit Model = Enzymes are flexible and the shapes of active sites can be modified by binding with a substrate Signup and view all the answers

Match the way enzymes act on substrates with their description:

Entropy reduction = Restrains motion of molecules and holds them in place for reaction to proceed Acid/base catalysis = Involves proton transfer, which is common in biochemical reactions Covalent catalysis = Formation of a transient covalent bond between enzyme and substrate Metal ion catalysis = Involves bound metal cofactor that helps orient substrate for the reaction or stabilize charged transition states Signup and view all the answers

Match the enzyme classification with its primary function:

Ligases = Combine molecules through aid of ATP Isomerases = Catalyze the rearrangement of atoms within a molecule Hydrolases = Catalyze hydrolysis or addition of water Oxidoreductases = Catalyze redox reactions Signup and view all the answers

Enzyme Catalysis and Reaction Rates Quiz

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Questions and Answers

Which type of enzyme catalyzes redox reactions?

What is the function of amylase?

Which enzyme catalyzes the digestion of lactose?

What is the main function of transferases?

Which subclass of isomerases involves the alteration of the spatial arrangement of atoms in a molecule?

What is the function of ligases in terms of molecule combination?

What is the main characteristic of enzymes as catalysts?

What is the role of cofactors in enzyme structure?

How do enzymes increase reaction rates?

'Lock-and-Key' model proposed by Emil Fischer implies that:

What is the main function of induced-fit model in enzyme-substrate interaction?

What does acid/base catalysis involve?

What is demonstrated in the reaction between an ester and carboxylate group?

What does metal ion catalysis involve?

What does binding energy (GB) facilitate in enzyme-substrate interaction?

Enzymes can alter the equilibrium constant of a reaction.

Ligases are a subclass of isomerases.

Enzymes are not highly regulated and their rate of activity cannot adjust to the condition of the cell.

Enzymes are not highly specific and do not selectively recognize proper substrate over other molecules.

All enzymes are made up of simple proteins only.

Prosthetic groups are not required for the biological function of enzymes.

Enzymes increase reaction rate by increasing the activation energy.

The lock-and-key model implies that the enzyme and the substrate interact by means of short-range forces that require close contact.

The induced-fit model states that enzymes are inflexible and the shapes of active sites cannot be modified by binding with a substrate.

Entropy reduction is not demonstrated in the reaction between an ester and carboxylate group.

Acid/base catalysis does not involve proton transfer in biochemical reactions.

Metal ion catalysis does not involve the orientation of the substrate for the reaction or stabilization of charged transition states.

Enzymes are biological catalysts that increase the rate of reaction by factors more than a million times without being used up.

Enzymes lower the activation energy by providing an alternate pathway for chemical reactions.

Enzymes measure the amount of product formed per unit time to determine reaction rates.

Enzyme names ending in -ase always identify the reacting substance.

Enzyme names ending in -ase always describe the function of the enzyme.

Common names of digestion enzymes often end in -in.

Oxidoreductases catalyze redox reactions and have subclasses such as oxidases and dehydrogenases.

Transferases involve the transfer of functional groups between two substrates.

Hydrolases catalyze hydrolysis or addition of water.

Lyases remove atoms to form a double bond or add atoms to a double bond.

In enzyme nomenclature, the name 'pepsin' identifies an enzyme that digests starch.

In enzyme classification, lipases belong to the subclass of lyases.

Match the enzyme classification with its description:

Match the enzyme nomenclature with its example:

Match the enzyme common names with their function:

Match the subclass of lyases with its function:

Match the subclass of isomerases with their primary function:

Match the enzyme property with its characteristic:

Match the enzyme structure component with its description:

Match the model of enzyme-substrate interaction with its description:

Match the way enzymes act on substrates with their description:

Match the enzyme classification with its primary function:

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