Medical Quiz

Enzymes Quiz

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How do enzymes increase the rate of a chemical reaction?

A. By providing additional reactants

B. By lowering the activation energy needed

C. By increasing the concentration of products

D. By breaking down the reactants


What would likely occur without enzymes in biological systems?

A. Reactions would occur at a normal rate.

B. Reactions would happen too slowly to support life.

C. Reactions would speed up uncontrollably.

D. Reactions would not be affected.


What is the definition of the term ‘optimum’?

A. The conditions at which the enzyme is most active.

B. The range of pH and temperature an enzyme works over.

C. The conditions at which the substrate is most active


What is the function of enzymes in biological processes?

A. To store genetic information

B. To speed up chemical reactions

C. To provide energy to cells

D. To transport oxygen


What is an enzyme?

A. A type of protein that increases the rate of a chemical reaction

B. A type of inorganic catalyst

C. A type of carbohydrate that provides energy

D. A type of lipid that stores genetic information


What is the role of an enzyme in a synthesis reaction?

A. To break down larger molecules into smaller products

B. To join smaller substrate molecules to produce a larger product

C. To increase the temperature of the reaction

D. To act as a substrate in the reaction



Which of the following conclusionscan be drawn from this graph?

A. The optimum pH of theenzyme is at pH 6

B. The optimum pH of the enzymeis at pH 4

C. The enzyme’s activity increases as pH increasesfrom pH 6 to pH 8

D. The enzyme’s activity is greater at pH 8


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

A. It is the part of the enzyme where a substrate attaches and a chemical reaction occurs.

B. It is the part of the enzyme that provides energy for the reaction.

C. It is the part of the enzyme that breaks down into amino acids.



In the diagram, what is letter A?

A. product

B. substrate

C. enzyme-substrate complex

D. active site


Enzymes are ________.​ This means they only work on one substrate.

A. complementary

B. catalysts

C. specific

D. proteins


What is the role of enzymes in anabolic reactions?

A. Enzymes break down large molecules into smaller molecules

B. Enzymes build up large molecules from smaller molecules

C. Enzymes provide energy for the reaction

D. Enzymes change the pH of the reaction


What is the reason for the drop in enzyme activity at temperatures above the optimum?

A. The activation energy increases

B. The substrate concentration decreases

C. The enzymes denature

D. The pH changes


What happens to enzymes at temperatures above the optimum?

A. They become more stable

B. They increase in concentration

C. They denature

D. They become more specific


Why are enzymes important in all living organisms?

A. They help in the breakdown of large molecules

B. They increase the rate of chemical reactions

C. They provide energy for cellular processes

D. They store genetic information


What happens to enzymes at the end of a chemical reaction?

A. They are used up.

B. They are unchanged.

C. They become less effective.

D. They are broken down.


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