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16 Questions

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Biology Chapter on Enzymes

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Questions and Answers

What is the primary function of enzymes in chemical reactions?

They decrease the activation energy required for the reaction. (correct)

They act as reactants in the reaction.

They increase the concentration of substrates.

They increase the temperature of the reaction.

In the lock-and-key model of enzyme action, how is the shape of the active site described?

Changing for each substrate.

Flexible and adapting.

Rigid and unchanging. (correct)

Variable depending on substrate concentration.

Which model of enzyme action allows for a greater range of substrate specificity?

Lock-and-Key Model.

Comparative Fit Model.

Induced Fit Model. (correct)

Basic Structure Model.

What occurs during the formation of the enzyme-substrate complex?

The enzyme and substrate form a transient complex. Signup and view all the answers

What environmental condition can be most detrimental to enzyme activity?

Extreme temperature. Signup and view all the answers

Which of the following factors does NOT affect enzyme activity?

Presence of other enzymes. Signup and view all the answers

What happens to the enzyme after it has catalyzed a reaction?

It can be reused for another substrate. Signup and view all the answers

What is the optimum pH range for most enzyme activity?

6 - 8. Signup and view all the answers

What defines an apoenzyme?

An enzyme without its non-protein moiety. Signup and view all the answers

What is required for the catalysis of chemical reactions by enzymes?

Specific substrates and active sites. Signup and view all the answers

Which of the following correctly describes a cofactor?

A non-protein component, either tightly or loosely bound to an enzyme. Signup and view all the answers

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

To bind specific substrates and facilitate catalysis. Signup and view all the answers

Which of the following describes the specificity of enzymes?

Enzymes can only catalyze reactions with certain substrates or bonds. Signup and view all the answers

What is the role of coenzymes?

They enhance enzyme activity and are loosely bound. Signup and view all the answers

What is activation energy?

The energy required to initiate a chemical reaction. Signup and view all the answers

Which statement about ribozymes is correct?

They are nucleic acid molecules acting as enzymes. Signup and view all the answers