Chemical Reactions and Enzymes-PPt MLVN

Multiple Choice

Why are chemical reactions and enzymes important for living organisms?

• They help organisms obtain energy and build new molecules.

• They only occur in non-living things.

• They are not necessary for life processes.

• They slow down all biological processes.

Multiple Choice

What are the elements or compounds that enter into a chemical reaction called?

• Reactants

• Products

• Catalysts

• Enzymes

Open Ended

Explain how mass and energy are conserved during chemical transformations, using an example from living organisms.

Multiple Choice

Which of the following statements is true about chemical reactions that absorb energy?

• They will not occur without a source of energy.

• They often occur on their own.

• They always release energy.

• They require no activation energy.

Fill in the Blanks

The energy needed to get a chemical reaction started is called

energy.

Open Ended

Describe the role of enzymes in speeding up chemical reactions and give an example of when enzymes are necessary in living organisms.

Multiple Select

Which of the following can affect the activity of enzymes?

• Temperature

• pH

• Regulatory molecules

• Light

Open Ended

Summarize what you learned about chemical reactions and enzymes in this lesson. How do you think this knowledge could be applied in real-life situations or future studies?

Open Ended

What happens to chemical bonds during chemical reactions?

Multiple Choice

What is the main function of enzymes in chemical reactions?

• To lower the activation energy of reactions

• To increase the temperature of reactions

• To provide energy for reactions

• To change the products of reactions

Open Ended

Based on the graph shown, explain how the presence of an enzyme affects the activation energy required for a chemical reaction.

Fill in the Blanks

Enzymes are very

, generally catalyzing only one type of chemical reaction.

Multiple Choice

Which of the following factors can affect the activity of enzymes?

• Temperature

• pH

• Regulatory molecules

• All of the above