Starter Quiz: Enzymes & Protein Structure

What type of biological molecule are enzymes?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

What is the region on an enzyme where the substrate binds called?

• Binding site

• Active site

• Reaction site

• Substrate pocket

Which level of protein structure is most directly responsible for the shape of an enzyme’s active site?

• Primary

• Secondary

• Tertiary

• Quaternary

What happens to an enzyme when it becomes denatured?

• It becomes more active

• Its shape changes and it no longer works

Enzymes speed up reactions by...

• Increasing temperature

• Adding energy to the system

• Lowering activation energy

• Changing the products

Which of the following best describes the 'lock and key' model of enzyme action?

• Enzymes are flexible and mold to fit any substrate

• Enzymes and substrates have complementary shapes

• Enzymes break down into substrates

• Substrates change the enzyme’s shape permanently

What type of bond is primarily responsible for maintaining the tertiary structure of proteins?

• Peptide bonds

• Hydrogen bonds

• Ionic and disulfide bonds

• Glycosidic bonds

8. Which factor does not affect enzyme activity?

• Temperature

• pH

• Enzyme concentration

• Color

Which of the following does not affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• Colour of the enzyme

What is meant by the term 'substrate specificity'?

• Enzymes can bind to any molecule

• Enzymes only work at high temperatures

• Each enzyme only binds to a specific substrate

• Substrates can change enzyme shape