Enzymes

Multiple Choice

Which of the following are examples of enzymes?

• Glucose, Sucrose

• Cholesterol, Butter

• Hemoglobin, Insulin

• Amylase, Lactase, Protease, Lipase

Multiple Choice

Why are catalysts important in chemical reactions?

• They slow down reactions

• They speed up reactions without being consumed

• They change the products of reactions

• They stop reactions completely

Multiple Select

Which of the following statements about enzymes are correct?

• Enzymes are organic catalysts made of protein

• Most enzymes end in -ase

• Enzymes increase the activation energy of reactions

• Enzymes make reactions happen slower

Multiple Choice

What is the main function of an enzyme in a chemical reaction?

• To lower the activation energy required for the reaction

• To increase the temperature of the reaction

• To provide energy for the reaction

• To change the products of the reaction

Fill in the Blanks

The molecule that an enzyme acts on is called a

.

Multiple Choice

Which factors can affect enzyme action?

• pH, temperature, and concentration of enzymes and substrates

• Light intensity and sound

• Amount of oxygen and carbon dioxide

• Size of the enzyme

Open Ended

Why does pepsin work best at a pH of 2, while amylase works best at a pH of 6.8?

Multiple Choice

What happens to enzyme activity when the temperature exceeds the optimal range?

• The enzyme activity increases indefinitely

• The enzyme becomes denatured and activity decreases

• The enzyme activity remains constant

• The enzyme changes into a different enzyme

Fill in the Blanks

When an enzyme loses its shape due to heat or pH changes, it is said to be

.

Multiple Select

Which of the following factors can denature an enzyme?

• High temperature

• Low substrate concentration

• Changes in pH

• Low enzyme concentration

Multiple Choice

What does the graph in the 'Concentration and Enzymes' slide show about the relationship between substrate concentration and rate of reaction?

• The rate of reaction decreases as substrate concentration increases

• The rate of reaction increases indefinitely with substrate concentration

• The rate of reaction increases to a point and then levels off

• The rate of reaction is not affected by substrate concentration

Multiple Select

​ Rate your understanding of enzymes on a scale of 1 to 5. ​ ​ ​ ​ ​

• What is an enzyme?

• 2 - I kinda get it

• 3 - I feel comfortable

• 4 - I can explain it to a friend

• 5 - I can teach a friend.