Enzymes in Biochemistry Quiz

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What is the role of a cofactor in an enzyme-catalyzed reaction?

The cofactor binds to the enzyme and prevents the reaction from occurring.
The cofactor is the substrate that the enzyme acts upon.
The cofactor is a metal ion or organic molecule that is needed for the enzyme-catalyzed reaction to take place. (correct)
The cofactor is a byproduct released after the enzyme-catalyzed reaction has occurred.

What is the difference between the lock-and-key model and the induced-fit model of enzyme specificity?

The lock-and-key model states that the enzyme-substrate complex is formed through covalent bonds, while the induced-fit model states that the complex is formed through non-covalent interactions.
The lock-and-key model states that the substrate must exactly match the shape of the active site, while the induced-fit model states that the active site can adjust to fit a variety of substrate shapes. (correct)
The lock-and-key model states that the active site is rigid, while the induced-fit model states that the active site is flexible.
The lock-and-key model states that the enzyme must be activated by a cofactor, while the induced-fit model states that the enzyme can function without a cofactor.

What is the difference between a competitive inhibitor and a noncompetitive inhibitor?

A competitive inhibitor is a substrate, while a noncompetitive inhibitor is a product of the enzyme-catalyzed reaction.
A competitive inhibitor increases the enzyme's activity, while a noncompetitive inhibitor decreases the enzyme's activity.
A competitive inhibitor is reversible, while a noncompetitive inhibitor is irreversible.
A competitive inhibitor binds to the enzyme's active site, while a noncompetitive inhibitor binds to the enzyme outside of the active site. (correct)

What is the role of zymogens in enzyme regulation?

Zymogens are inactive forms of enzymes that can be converted to the active form when needed. (D) Signup and view all the answers

How do enzymes function as diagnostic tools?

Enzymes are released from cells when they are damaged, and the presence of these enzymes in the body can be used to diagnose certain conditions. (C) Signup and view all the answers

How do enzymes affect the speed of chemical reactions?

Enzymes increase the speed of chemical reactions by lowering the energy requirement. (A) Signup and view all the answers

What is the main function of enzymes?

Increasing the rate of chemical reactions (A) Signup and view all the answers

How do enzymes differ from ordinary reactions?

Enzymes do not undergo chemical changes during catalysis (D) Signup and view all the answers

What suffix is commonly found at the end of enzyme names?

-ase (A) Signup and view all the answers

Which theory describes enzymes as having high specificity?

Lock-and-key theory (B) Signup and view all the answers

What happens to enzymes during catalysis?

They remain unchanged and can be reused (D) Signup and view all the answers

Which model or theory provides a simple way of explaining the function of enzymes?

Lock-and-key theory (A) Signup and view all the answers

Enzymes in Biochemistry Quiz

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