QUIZ 1

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered denature
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

What is a substance called if it speeds up a chemical reaction?

• reusable
• catalyst
• specific
• fragile

Can a change in pH alter the active site of an enzyme

• yes

• no

Enzymes are composed of which of the following monomers? 

• amino acids
• carbohydrates
• nucleotides
• monosaccharides

What is indicated by letter A?

• enzyme
• product
• substrate
• active site

What is indicated by letter C?

• enzyme

• product

• substrate

• active site

What is indicated by letter B?

• enzyme

• product

• substrate

• active site

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.