Enzymes Quiz

What is an enzyme?

• A) A type of carbohydrate

• B) A type of lipid

• C) A protein that speeds up chemical reactions

• D) A type of nucleic acid

What is meant by the 'active site' of an enzyme?

• A) The region that binds to substrates

• B) The region that temporarily stores energy

• C) The part of the enzyme that moves during a reaction

• D) The site where enzymes are synthesized within the cell

What happens to an enzyme when it is denatured?

• A) It speeds up reactions more efficiently.

• B) It binds more substrates at once.

• C) It loses its specific shape and can no longer catalyse reactions.

• D) It splits into smaller enzyme molecules.

What is the primary function of enzymes in the human body?

• A) To provide energy to cells

• B) To speed up chemical reactions

• C) To produce body heat

• D) To build cell membranes

Which of the following statements best describes an enzyme?

• A) Enzymes are carbohydrates that digest fats.

• B) Enzymes are lipids that enhance oxygen transport.

• C) Enzymes are proteins that act as biological catalysts.

• D) Enzymes are nucleic acids involved in cell division.

Which condition generally affects the activity of an enzyme?

• A) Colour of the enzyme

• B) pH of the environment

• C) Shape of the cell

• D) Size of the enzyme molecule

Why are enzymes specific to particular substrates?

• A) Because of their molecular size

• B) Because of their electrical charge

• C) Because of the unique fit between the substrate and the enzyme's active site

• D) Because enzymes are able to change their shape to fit any substrate

Which factor does NOT affect enzyme activity?

• A) Temperature

• B) Substrate concentration

• C) Presence of inhibitors

• D) Color of the substrate

What typically happens to an enzyme after it catalyses a reaction?

• A) It is consumed by the reaction.

• B) It remains unchanged and can catalyse another reaction.

• C) It dissolves into simple sugars.

• D) It permanently binds with the product.

How does a rise in temperature generally affect enzyme activity?

• A) Increases activity until an optimal temperature is reached

• B) Decreases activity continuously

• C) Has no effect on activity

• D) Immediately denatures the enzyme