Exploring Enzymes and Activation Energy

What do cells rely on to initiate and accelerate chemical reactions?

• Enzymes

• Carbohydrates

• Lipids

• Nucleic acids

What would happen to chemical reactions in the absence of enzymes?

• They would occur at the same rate

• They would occur faster

• They would proceed too slowly to support life

• They would not occur at all

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In a chemical reaction, what do the reactants form?

• Enzymes

• Energy

• Catalysts

• Products

What does the 'speed bump' in the graph represent?

• The energy level of the products

• The energy level of the reactants

• The efficiency of the reaction

• The activation energy

How do enzymes affect the activation energy of a reaction?

• They increase it

• They decrease it

• They eliminate it

• They do not affect it

What is the effect of enzymes on the rate of chemical reactions?

• They speed up the reactions

• They stop the reactions

• They slow down the reactions

• They have no effect on the rate

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NGSS.HS-LS1-7

NGSS.HS-PS1-5

Which bodily processes would be too slow without enzymes?

• Breathing and circulation

• Digestion and nerve impulse processing

• Cell division and growth

• Muscle contraction and relaxation

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