Enzymes quiz

1. "Enzymes help to increase the rate of reaction. They are known as biological (a)   ." What is the missing word in this sentence? Give your answer as a single word with no period at the end.

2. Which type of macromolecule / biomolecule are most enzymes?

• Carbohydrates
• Lipids
• Proteins
• Nucleic Acids

Tags

NGSS.HS-LS1-6

4. "When an enzyme's active site has changed shape due to environmental conditions beyond its optimum range, we say the enzyme has been (a)   ." What is the missing word in this sentence? Give your answer as a single word with no period at the end.

5. Which two environmental factors can cause this to occur?

• pH
• Salinity
• Substrate concentration
• Temperature
• Toxicity

Tags

NGSS.HS-LS2-2

NGSS.HS-LS2-6

NGSS.HS-LS4-5

6. Which line shows the reaction occurring in the presence of an enzyme?

• The solid line
• The dashed line

7. "The energy required by the molecules for a reaction to begin is known as the (a)   energy." What is the missing word in this sentence? Give your answer as a single word with no period at the end.

8. At point A of the graph, increasing the temperature results in an increased rate of reaction. Why does increasing temperature increase the rate of reaction?

• The activation energy is halved so the reaction can start more quickly
• The enzyme and substrate molecules move faster and collide more frequently
• The enzymes are able to target substrate molecules with more efficency
• Bonds between the enzyme and the substrate molecules form more quickly

Tags

NGSS.HS-PS1-5

9. What is happening at point B?

• The substrate concentration has decreased
• The enzyme concentration has decreased
• The enzyme has become denatured
• The pH has fallen too low

10. What is the optimum temperature of this enzyme? Give your answer as digits (not words) with no period at the end. Do not include units. Example: 18

(a)  

11. Below are statements about pH. Two of these statements are false. Identify these.

• Enzymes have an optimal pH range
• Enzymes only get denatured at high pHs
• pH outside an enzyme's optimal range can break the bonds in an enzyme
• pH is a measure of many H+ ions there are in a solution
• An acid is a solution that has a pH value above 7.0