Introduction to Catalysis quiz #1 Flashcards
Introduction to Catalysis quiz #1
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How do enzymes speed up chemical reactions?
Enzymes speed up chemical reactions by lowering the activation energy, stabilizing the transition state, altering the reaction mechanism, and increasing reactant reactivity. How do enzymes speed up biochemical reactions?
Enzymes speed up biochemical reactions by lowering the activation energy, stabilizing the transition state, and increasing the reactivity of reactants. What is the purpose of an enzyme?
The purpose of an enzyme is to act as a biological catalyst, speeding up chemical reactions without being consumed. What is the function of enzymes?
Enzymes function as catalysts to increase the rate of chemical reactions by lowering the activation energy. Why do all enzymatic reactions need activation energy?
Activation energy is needed to initiate a reaction by allowing reactants to reach the transition state. Which of the following best explains why enzymes are necessary for many cellular reactions? A) They increase the equilibrium constant. B) They lower the activation energy. C) They are consumed in the reaction. D) They increase the energy of reactants.
B) They lower the activation energy. What is the purpose of enzymes?
The purpose of enzymes is to catalyze reactions by lowering the activation energy and increasing reaction rates. How does an enzyme increase the rate of the chemical reaction it catalyzes?
An enzyme increases the rate by lowering the activation energy and stabilizing the transition state. Enzymes catalyze chemical reactions by doing which of the following? A) Consuming reactants B) Lowering activation energy C) Increasing equilibrium constant D) Raising activation energy
B) Lowering activation energy What is meant by the statement 'enzymes are biological catalysts'?
It means enzymes speed up chemical reactions in living organisms without being consumed. Why are enzymes required for living things to function?
Enzymes are required because they catalyze essential biochemical reactions necessary for life processes. What is the role of enzymes?
The role of enzymes is to catalyze and accelerate chemical reactions by lowering activation energy. Which of the following are proteins which act as catalysts to help complex reactions occur? A) Hormones B) Enzymes C) Antibodies D) Lipids
B) Enzymes Which statement best describes the use of catalytic converters in automobiles?
Catalytic converters use catalysts to speed up the conversion of harmful gases into less harmful emissions. How do enzymes affect a chemical reaction?
Enzymes affect a chemical reaction by lowering the activation energy, thus increasing the reaction rate. How do enzymes change the speed of a chemical reaction?
Enzymes change the speed by lowering the activation energy, making the reaction proceed faster. How do enzymes catalyze biological reactions? Select all that apply. A) Lowering activation energy B) Consuming reactants C) Stabilizing transition state D) Increasing equilibrium constant
A) Lowering activation energy, C) Stabilizing transition state Why are enzymes necessary?
Enzymes are necessary because they catalyze reactions essential for cellular functions and life processes. Which statement best describes the function of enzymes?
Enzymes function as catalysts that lower activation energy and increase reaction rates. What do enzymes do to the activation energy of a reaction?
Enzymes lower the activation energy of a reaction. Which of the following are true about enzymes? A) They are consumed in reactions B) They lower activation energy C) They increase equilibrium constant D) They are proteins
B) They lower activation energy, D) They are proteins What is the role of an enzyme?
The role of an enzyme is to catalyze reactions by lowering activation energy and increasing reaction rates. Which is true about enzymes? A) They are consumed in reactions B) They lower activation energy C) They increase equilibrium constant D) They are lipids
B) They lower activation energy What term refers to a biological catalyst that lacks an essential cofactor?
Apoenzyme What is the relationship between enzymes and activation energy?
Enzymes lower the activation energy required for a reaction to proceed. What is the job of an enzyme?
The job of an enzyme is to catalyze chemical reactions by lowering activation energy. How do enzymes catalyze reactions?
Enzymes catalyze reactions by lowering activation energy and stabilizing the transition state. What organic molecules catalyze (speed up) chemical reactions?
Enzymes, which are proteins, catalyze chemical reactions. How do enzymes lower the activation energy of chemical reactions? Select all that apply. A) Stabilizing transition state B) Consuming reactants C) Altering reaction mechanism D) Increasing equilibrium constant
A) Stabilizing transition state, C) Altering reaction mechanism How does an enzyme catalyze a reaction?
An enzyme catalyzes a reaction by lowering the activation energy and stabilizing the transition state. Why are enzymes known as biocatalysts?
Enzymes are known as biocatalysts because they catalyze reactions in biological systems. What is the role of enzymes in biological reactions?
Enzymes catalyze biological reactions by lowering activation energy and increasing reaction rates. Why does an enzyme usually only catalyze a specific chemical reaction?
An enzyme usually catalyzes a specific reaction due to its unique active site that fits specific substrates. Which of the following are true statements about an enzyme-catalyzed reaction? A) Enzymes are consumed B) Activation energy is lowered C) Reaction rate is increased D) Equilibrium constant is changed
B) Activation energy is lowered, C) Reaction rate is increased Why are enzymes important to organisms?
Enzymes are important because they catalyze essential biochemical reactions necessary for life processes. How does an enzyme catalyze a chemical reaction?
An enzyme catalyzes a chemical reaction by lowering the activation energy and stabilizing the transition state. Why are enzymes so important?
Enzymes are important because they facilitate and speed up biochemical reactions necessary for life. What is an enzyme-catalyzed reaction?
An enzyme-catalyzed reaction is a chemical reaction that is accelerated by an enzyme. What is the substance that helps speed up biochemical reactions?
Enzymes are substances that help speed up biochemical reactions. How do enzymes make chemical reactions more efficient?
Enzymes make reactions more efficient by lowering activation energy and increasing reaction rates.
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