Enzymes Chapter 1 by Dr. Zinab Ahmed Abdelgawad

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What is the primary function of enzymes in biochemical reactions?

To consume the reactants in the reaction

To increase the rate of chemical reaction (correct)

To decrease the energy of activation

To alter the reactants in the reaction

What is the term for the area on the enzyme where the substrate binds?

Catalytic site

Active site (correct)

Reaction site

Binding site

What is the term for the enzyme without its non-protein component?

Active enzyme

Apoenzyme (correct)

Holoenzyme

Inactive enzyme

What is the role of enzymes in biochemical reactions?

To catalyze the reaction Signup and view all the answers

What happens to enzymes during a biochemical reaction?

They are reusable Signup and view all the answers

What is the term for the substance on which an enzyme begins its action?

Substrate Signup and view all the answers

What is the characteristic of a competitive inhibitor molecule?

It has a similar structure to the substrate molecule Signup and view all the answers

Where does an allosteric inhibitor molecule bind to the enzyme?

At an alternative site Signup and view all the answers

What is the result of an allosteric inhibitor binding to the enzyme?

Change in enzyme shape, preventing substrate binding Signup and view all the answers

What is the term used to describe the phenomenon of allosteric inhibition?

Allosteric effect Signup and view all the answers

What is the characteristic of an allosteric inhibitor molecule?

It is structurally different from the substrate molecule Signup and view all the answers

What is the nature of allosteric inhibition?

Reversible Signup and view all the answers

What is the primary role of enzymes in a reaction?

To decrease the activation energy of the reaction Signup and view all the answers

What is the energy barrier between reactants and products called?

Activation energy Signup and view all the answers

Which theory proposes that the active site of the enzyme is complementary in shape to the substrate?

Lock and key theory Signup and view all the answers

What is the result of the enzyme-substrate complex forming?

The substrate is transformed into products Signup and view all the answers

What is the function of the active site of an enzyme?

To fit the substrate and facilitate the reaction Signup and view all the answers

What is the primary difference between the lock and key theory and the induced fit theory?

The shape of the active site Signup and view all the answers

What is the relationship between the rate of enzyme action and the concentration of enzyme, provided there is a sufficient supply of substrate and constant conditions?

The rate of enzyme action is directly proportional to the concentration of enzyme. Signup and view all the answers

At what point does the reaction rate become maximal?

When the enzyme is completely saturated with the substrate. Signup and view all the answers

What is the temperature range at which the optimum temperature is reached in humans?

37-40 C Signup and view all the answers

What is the reason for the increase in the rate of reaction with an increase in temperature?

Increase in the initial energy of the substrate and decrease in the activation energy. Signup and view all the answers

What happens to the reaction rate when the substrate concentration increases beyond the point of maximum activity?

The reaction rate remains constant. Signup and view all the answers

What is the term for the maximum rate of reaction that can be achieved by an enzyme?

Vmax Signup and view all the answers

What does the enzyme classification number EC: 2.7.1.1 represent?

Transferases subclass with phosphate as acceptor Signup and view all the answers

Enzymes Chapter 1 by Dr. Zinab Ahmed Abdelgawad

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Questions and Answers

What is the primary function of enzymes in biochemical reactions?

What is the term for the area on the enzyme where the substrate binds?

What is the term for the enzyme without its non-protein component?

What is the role of enzymes in biochemical reactions?

What happens to enzymes during a biochemical reaction?

What is the term for the substance on which an enzyme begins its action?

What is the characteristic of a competitive inhibitor molecule?

Where does an allosteric inhibitor molecule bind to the enzyme?

What is the result of an allosteric inhibitor binding to the enzyme?

What is the term used to describe the phenomenon of allosteric inhibition?

What is the characteristic of an allosteric inhibitor molecule?

What is the nature of allosteric inhibition?

What is the primary role of enzymes in a reaction?

What is the energy barrier between reactants and products called?

Which theory proposes that the active site of the enzyme is complementary in shape to the substrate?

What is the result of the enzyme-substrate complex forming?

What is the function of the active site of an enzyme?

What is the primary difference between the lock and key theory and the induced fit theory?

What is the relationship between the rate of enzyme action and the concentration of enzyme, provided there is a sufficient supply of substrate and constant conditions?

At what point does the reaction rate become maximal?

What is the temperature range at which the optimum temperature is reached in humans?

What is the reason for the increase in the rate of reaction with an increase in temperature?

What happens to the reaction rate when the substrate concentration increases beyond the point of maximum activity?

What is the term for the maximum rate of reaction that can be achieved by an enzyme?

What does the enzyme classification number EC: 2.7.1.1 represent?

Which enzyme is represented by the code number EC: 1.1.1.1?

What is the specific name of the enzyme with EC: 2.7.1.1?

What is the biochemical activity of oxidoreductases?

What is the reaction catalyzed by Hexokinase?

Which of the following enzymes is an example of a transferase?

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