Biochemistry: Enzyme Catalysis and Chemical Kinetics

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Questions and Answers

What is the primary focus of chemical kinetic reaction?

The equilibrium constant of a reaction

The rate of a chemical reaction (correct)

The yield of a reaction

The feasibility of a reaction

What are the two aspects of studying a chemical reaction?

Equilibrium and kinetics

Thermodynamics and stoichiometry

Kinetics and catalysis

Thermodynamics and kinetics (correct)

What is the unit of measurement for the rate of a chemical reaction?

Moles per second

Moles per liter per second (correct)

Liters per mole per second

None of the above

What is the term for the speed or velocity of a chemical reaction?

Reaction velocity Signup and view all the answers

What is the symbol commonly used to represent the rate of a chemical reaction?

V Signup and view all the answers

What is the significance of ΔGͦ = 0?

The reaction is at equilibrium Signup and view all the answers

What is the relationship between Keq and the concentrations of A and B at equilibrium?

Keq = [B]/[A] Signup and view all the answers

What is the pH at which the reaction takes place at equilibrium?

pH 7 Signup and view all the answers

What is the significance of constant temperature in the reaction?

It ensures the reaction is at equilibrium Signup and view all the answers

What is the characteristic of the reaction at equilibrium?

The reaction takes place at constant temperature and pH Signup and view all the answers

What is a characteristic of an enzyme-catalyzed reaction?

Can convert product back to substrate Signup and view all the answers

What is true about the substrate in an enzyme-catalyzed reaction?

It can be converted back into a product Signup and view all the answers

What is the key difference between an enzyme-catalyzed reaction and a non-enzyme-catalyzed reaction?

The reaction is reversible only with an enzyme Signup and view all the answers

What is the role of an enzyme in a reversible reaction?

To catalyze the forward and reverse reactions Signup and view all the answers

What is a consequence of an enzyme-catalyzed reaction being reversible?

The reaction can be influenced by equilibrium Signup and view all the answers

What is the equilibrium constant designated as under certain conditions?

K 'eq Signup and view all the answers

Which type of reaction has a ΔGͦ value less than 0?

Exergonic reaction Signup and view all the answers

In an equilibrium reaction, what is the relationship between the rate of formation of products and reactants?

The rate of formation of products equals the rate of formation of reactants Signup and view all the answers

What is the role of enzymes in a chemical reaction?

Enzymes do not alter the direction of the chemical equilibrium of the reaction Signup and view all the answers

What type of reaction is characterized by a ΔGͦ value greater than 0?

Endergonic reaction Signup and view all the answers

What is a characteristic of reversible reactions?

They release energy Signup and view all the answers

What is the role of enzymes in chemical reactions?

They catalyze both forward and backward reactions equally. Signup and view all the answers

What is the effect of enzymes on the equilibrium of a chemical reaction?

They do not alter the equilibrium. Signup and view all the answers

How do enzymes affect the rate of a chemical reaction?

They accelerate the attainment of equilibrium. Signup and view all the answers

What is the relationship between enzymes and the attainment of equilibrium?

Enzymes accelerate the attainment of equilibrium. Signup and view all the answers

What is the effect of enzymes on the forward and backward reactions?

They catalyze both reactions equally. Signup and view all the answers

Study Notes

Chemical Reactions and Enzymes

A chemical reaction is studied in two aspects: thermodynamics and kinetics.
Chemical kinetic reaction is the study of the rate (velocity) of a chemical reaction, represented by V values.

Reversible Reactions and Enzymes

Enzymes can easily turn a product into a substrate and vice versa, making the reaction reversible.
In a reversible reaction, ΔG˚ = 0.
At equilibrium, the reaction takes place at constant temperature and pH (pH 7), and Keq = [B]/[A].

Equilibrium Constants

The equilibrium constant under constant temperature and pH conditions is designated K'eq.
There are three types of reactions based on ΔG˚:
- Exergonic reactions: ΔG˚ < 0, products have lower energy than substrates, spontaneous, and release energy.
- Endergonic reactions: ΔG˚ > 0, products have higher energy than substrates, non-spontaneous, and require energy.
- Equilibrium reactions: ΔG˚ = 0, equilibrium in the energy of reactants and products, no release or requirement of energy.

Importance of Enzymatic Chemical Reactions

Enzymes do not alter the direction of the chemical equilibrium of the reaction.
Enzymes catalyze the forward and backward reactions equally and do not alter the equilibrium itself.
Enzymes accelerate the attainment of equilibrium.

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Description

This quiz covers the catalytic action of enzymes in biochemical reactions, including the study of chemical kinetics and thermodynamics in chemical reactions.