Practice Unit 3 Test Energy Flow

Enzymes are ______.

• Lipids

• Carbohydrates

• Proteins

• Nucleic Acids

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HS-LS1-5

Enzymes & Biochemical Reactions

The activation energy needed for a chemical reaction is decreased by the presence of a

• A. catalyst

• B. reactant

• C. product

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HS-LS1-5

Enzymes & Biochemical Reactions

Which phrase best describes an exothermic chemical reaction?

• A. Does not absorb any energy.

• B. Forms products with higher bond energy than reactants.

• C. Is in a state of equilibrium.

• D. Releases more energy than it absorbs.

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Enzymes & Biochemical Reactions

HS-LS1-5

Chemical reactions that absorb more energy than they release are considered to be

• A. exothermic

• B. catalyzed

• C. endothermic.

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HS-LS1-5

Enzymes & Biochemical Reactions

If the activation energy of a biochemical reaction is lowered, then

• A. the reaction will happen faster.

• B. the reaction will happen more slowly.

• C. more energy will need to be absorbed.

• D. the rate of the reaction will be unaffected.

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HS-LS1-5

Enzymes & Biochemical Reactions

The molecule that an enzyme binds to is known as its

• A. substrate

• B. monomer

• C. polymer

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Enzymes & Biochemical Reactions

HS-LS1-5

What happens to an enzyme when it is denatured?

• Activation energy is lowered.
• It becomes stronger.
• It loses its shape.
• Activation energy is raised.

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HS-LS1-5

Enzymes & Biochemical Reactions

Which structures pictured would make up an ATP molecule?

• 
• 
• 

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HS-LS1-6

ATP

Where does your body get the energy for reattaching a third phosphate to ADP, creating ATP?

• A. from the sun

• B. usually from carbs

• C. from nucleic acids

• D. from breaking ATP

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HS-LS1-6

ATP

Energy is released from an ATP molecule for cellular processes when it

• A. converts a phosphate group to ADP.

• B. attaches an extra phosphate group.

• C. releases the 3rd phosphate.

• D. produces a sugar molecule.

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HS-LS1-6

ATP