Enzymes Quiz

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18 Questions

What are enzymes?

Protein catalysts of chemical reaction

What happens to proteins at temperatures above 40℃?


What function do oxidoreductase enzymes perform?

Catalyze an oxidation-reduction reaction

What is the main function of enzymes?

Catalyst (Hasten a chemical reaction without themselves undergoing a change or being used up in this chemical reaction)

Are enzymes specific for a substrate?

Yes, enzymes are specific for a substrate they can convert

What is enzyme kinetics?

Reaction occurs spontaneously if free energy is higher for substrate than product

What is the function of lyases enzymes?

Catalyzes the removal of groups without hydrolysis

What does a high number in serum usually indicate?

Organ damage or cell injury

What are inhibitors?

Molecules that interfere with the chemical reaction

What function do isomerase enzymes perform?

Catalyze the intramolecular arrangement of the substrate compound

What is sucrose?

A disaccharide

What function do ligases enzymes perform?

Catalyzes the joining of two substrate molecules

What is the common carbohydrate in the body that sucrose is broken down into?


What is the purpose of an enzyme in breaking down sucrose?

To make the reaction faster

What happens when a substrate binds to the active site?

Forms an enzyme-substrate complex

What happens after the formation of the enzyme-substrate complex?

Product-enzyme complex is formed

What is released by the enzyme in the product-enzyme complex?


What are the two theories of enzyme action?

Fischer’s Template theory and Koshland’s Induced Fit theory

Study Notes

Enzymes Basics

  • Enzymes are biological molecules that catalyze chemical reactions in living organisms.

Enzyme Properties

  • Proteins denature (unfold) at temperatures above 40°C, leading to loss of enzyme activity.
  • Enzymes are highly specific for a particular substrate (substrate specificity).

Enzyme Classification

  • Oxidoreductase enzymes catalyze oxidation and reduction reactions.
  • Lyases enzymes cleave various chemical bonds without hydrolysis or oxidation.
  • Isomerase enzymes catalyze the interconversion of isomers.
  • Ligases enzymes catalyze the formation of covalent bonds between molecules.

Enzyme Function

  • The main function of enzymes is to increase the rates of chemical reactions in biological systems.
  • Enzyme kinetics is the study of the rates of enzyme-catalyzed reactions.

Inhibitors and Regulation

  • Inhibitors are molecules that decrease enzyme activity.
  • Competitive inhibitors bind to the active site, while non-competitive inhibitors bind to an allosteric site.

Carbohydrates and Sucrose

  • Sucrose is a common carbohydrate that is broken down into glucose and fructose in the body.
  • The purpose of an enzyme (sucrase) in breaking down sucrose is to convert it into easily absorbable sugars.

Enzyme-Substrate Complex

  • When a substrate binds to the active site, an enzyme-substrate complex is formed.
  • The enzyme-substrate complex then undergoes a conformational change, positioning the substrate for catalysis.
  • After the reaction, the product is released, and the enzyme is regenerated from the product-enzyme complex.

Test your knowledge about enzymes with this quiz. Explore questions about the functions, properties, and effects of enzymes, including denaturation and prosthetic groups.

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