Uncover the secrets of this biochemical reaction through the study of “Enzyme MCQs” based on 9th-class biology, on structure, mechanism, and role played by enzymes in metabolic processes. The MCQs hereby assist in clearly comprehending the activity of enzymes, factors affecting the activity of enzymes, and their biological roles. Ideal for enhancing your exam preparation!
Enzymes are:
a) Carbohydrates
b) Lipids
c) Proteins
d) Nucleic acids
Enzymes act as:
a) Energy carriers
b) Catalysts
c) Structural elements
d) Signaling molecules
Enzymes increase the rate of chemical reactions by:
a) Increasing the temperature of the reaction
b) Lowering the activation energy
c) Increasing the concentration of reactants
d) Inhibiting the formation of products
The specific region of an enzyme where the substrate binds is called the:
a) Active site
b) Inhibitory site
c) Allosteric site
d) Coenzyme site
Enzymes work by:
a) Increasing the free energy of the reactants
b) Decreasing the free energy of the products
c) Increasing the activation energy of the reaction
d) Lowering the activation energy of the reaction
The process by which an enzyme loses its shape and function due to high temperature or extreme pH is called:
a) Denaturation
b) Inhibition
c) Activation
d) Substrate binding
The molecule on which an enzyme acts is called the:
a) Coenzyme
b) Substrate
c) Cofactor
d) Product
Enzymes are highly specific, meaning they:
a) Can catalyze any type of reaction
b) Only work with one type of substrate
c) Are not affected by pH or temperature changes
d) Can work with any type of cofactor
The activation energy is the energy required to:
a) Start a chemical reaction
b) Stop a chemical reaction
c) Speed up a chemical reaction
d) Slow down a chemical reaction
Enzymes are essential for living organisms because they:
a) Provide energy for cellular processes
b) Produce oxygen during photosynthesis
c) Regulate body temperature
d) Facilitate biochemical reactions
The lock-and-key model of enzyme-substrate interaction suggests that:
a) The enzyme and substrate undergo a conformational change to bind
b) The enzyme’s shape is complementary to the substrate’s shape
c) Enzymes and substrates are chemically bound to each other
d) Enzymes can only bind one substrate at a time
Which of the following factors can influence enzyme activity?
a) Temperature and pH
b) Atmospheric pressure
c) Electrical conductivity
d) Sunlight intensity
The substance that an enzyme converts into a product is called the:
a) Cofactor
b) Coenzyme
c) Inhibitor
d) Substrate
Enzymes are important in digestion because they:
a) Absorb nutrients from the digestive tract
b) Break down large molecules into smaller ones
c) Facilitate gas exchange in the lungs
d) Pump blood throughout the body
The process of an enzyme’s shape being altered due to high temperature or extreme pH
is called:
a) Activation
b) Catalysis
c) Denaturation
d) Inhibition
Enzymes can be denatured by:
a) Low temperature
b) Neutral pH
c) Optimal pH
d) High temperature
The substance that binds to the active site of an enzyme and prevents it from working is called a/an:
a) Substrate
b) Activator
c) Cofactor
d) Inhibitor
Enzymes are affected by changes in temperature and pH because:
a) They are made of unstable molecules
b) They rely on high energy for catalysis
c) They are sensitive to their environment
d) They need cofactors to function
The process by which enzymes return to their original shape after the reaction is complete is called:
a) Substrate binding
b) Product formation
c) Denaturation
d) Enzyme recycling
Enzymes can be denatured by extreme changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzymes can be denatured by changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
The substance that binds to the active site of an enzyme and prevents it from working is called a/an:
a) Substrate
b) Activator
c) Cofactor
d) Inhibitor
Enzymes are affected by changes in temperature and pH because:
a) They are made of unstable molecules
b) They rely on high energy for catalysis
c) They are sensitive to their environment
d) They need cofactors to function
The process by which enzymes return to their original shape after the reaction is complete is called:
a) Substrate binding
b) Product formation
c) Denaturation
d) Enzyme recycling
Enzymes can be denatured by extreme changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzymes can be denatured by changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
The process by which an enzyme loses its shape and function due to high temperature or extreme pH is called:
a) Denaturation
b) Inhibition
c) Activation
d) Substrate binding
The molecule on which an enzyme acts is called the:
a) Coenzyme
b) Substrate
c) Cofactor
d) Product
Enzymes are highly specific, meaning they:
a) Can catalyze any type of reaction
b) Only work with one type of substrate
c) Are not affected by pH or temperature changes
d) Can work with any type of cofactor
The activation energy is the energy required to:
a) Start a chemical reaction
b) Stop a chemical reaction
c) Speed up a chemical reaction
d) Slow down a chemical reaction
Enzymes are essential for living organisms because they:
a) Provide energy for cellular processes
b) Produce oxygen during photosynthesis
c) Regulate body temperature
d) Facilitate biochemical reactions
The lock-and-key model of enzyme-substrate interaction suggests that:
a) The enzyme and substrate undergo a conformational change to bind
b) The enzyme’s shape is complementary to the substrate’s shape
c) Enzymes and substrates are chemically bound to each other
d) Enzymes can only bind one substrate at a time
Which of the following factors can influence enzyme activity?
a) Temperature and pH
b) Atmospheric pressure
c) Electrical conductivity
d) Sunlight intensity
The substance that an enzyme converts into a product is called the:
a) Cofactor
b) Coenzyme
c) Inhibitor
d) Substrate
Enzymes are important in digestion because they:
a) Absorb nutrients from the digestive tract
b) Break down large molecules into smaller ones
c) Facilitate gas exchange in the lungs
d) Pump blood throughout the body
The process of an enzyme’s shape being altered due to high temperature or extreme pH
is called:
a) Activation
b) Catalysis
c) Denaturation
d) Inhibition
Enzymes can be denatured by:
a) Low temperature
b) Neutral pH
c) Optimal pH
d) High temperature
The substance that binds to the active site of an enzyme and prevents it from working is called a/an:
a) Substrate
b) Activator
c) Cofactor
d) Inhibitor
Enzymes are affected by changes in temperature and pH because:
a) They are made of unstable molecules
b) They rely on high energy for catalysis
c) They are sensitive to their environment
d) They need cofactors to function
The process by which enzymes return to their original shape after the reaction is complete is called:
a) Substrate binding
b) Product formation
c) Denaturation
d) Enzyme recycling
Enzymes can be denatured by extreme changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzymes can be denatured by changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
Enzymes can be denatured by changes in:
a) Atmospheric pressure
b) Electrical conductivity
c) pH and temperature
d) Sunlight intensity
Enzyme activity can be affected by:
a) The presence of competitive and non-competitive inhibitors
b) The number of coenzymes present
c) The rate of diffusion in the reaction medium
d) The color of the reaction medium
The process by which an enzyme loses its shape and function due to high temperature or extreme pH is called:
a) Denaturation
b) Inhibition
c) Activation
d) Substrate binding
The molecule on which an enzyme acts is called the:
a) Coenzyme
b) Substrate
c) Cofactor
d) Product
Enzymes are highly specific, meaning they:
a) Can catalyze any type of reaction
b) Only work with one type of substrate
c) Are not affected by pH or temperature changes
d) Can work with any type of cofactor
The activation energy is the energy required to:
a) Start a chemical reaction
b) Stop a chemical reaction
c) Speed up a chemical reaction
d) Slow down a chemical reaction
Enzymes are essential for living organisms because they:
a) Provide energy for cellular processes
b) Produce oxygen during photosynthesis
c) Regulate body temperature
d) Facilitate biochemical reactions
The lock-and-key model of enzyme-substrate interaction suggests that:
a) The enzyme and substrate undergo a conformational change to bind
b) The enzyme’s shape is complementary to the substrate’s shape
c) Enzymes and substrates are chemically bound to each other
d) Enzymes can only bind one substrate at a time
Which of the following factors can influence enzyme activity?
a) Temperature and pH
b) Atmospheric pressure
c) Electrical conductivity
d) Sunlight intensity
The substance that an enzyme converts into a product is called the:
a) Cofactor
b) Coenzyme
c) Inhibitor
d) Substrate
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