AP Biology: Unit 8

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?

• catalysis
• anabolism
• dehydration
• catabolism

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Which of the following is true for anabolic pathways?

• They do not depend on enzymes.
• They are usually highly spontaneous chemical reactions.
• They consume energy to build up polymers from monomers

Whenever energy is transformed, there is always an increase in the... 

• entropy of the universe
• enthalpy of the universe
• free energy of the universe

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A system at chemical equilibrium...

• releases energy at a steady rate 
• can do no work
• consumes energy at a steady rate
• has 0 kinetic energy

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Allosteric enzyme regulation is usually associated with...

• lack of cooperativity 
• feedback inhibition
• an enzyme with more than one subunit
• the need for cofactors 

The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is most precisely described as

• feedback inhibition
• metabolic inhibition
• allosteric inhibition
• reversible inhibition

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How does a noncompetitive inhibitor decrease the rate of an enzyme reaction?

• by binding at the active site of the enzyme
• by changing the shape of the enzyme's active site
•  by changing the free energy change of the reaction
• by acting as a coenzyme for the reaction 

Which of the following statements is true concerning catabolic pathways?

• They combine molecules into more energy-rich molecules.
• They are endergonic.
• They supply energy, primarily in the form of ATP, for the cell's work.
• They are spontaneous and do not need enzyme catalysis.

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Why is ATP an important molecule in metabolism?

•  It provides energy coupling between exergonic and endergonic reactions.
• Its hydrolysis provides an input of free energy for exergonic reactions
• Its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases free energy
• It is one of the four building blocks for DNA synthesis

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NGSS.HS-LS1-7

Which of the following metabolic processes can occur without a net influx of energy from some other process? 

• ADP + Pi → ATP + H₂O
• 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
• C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O
•  glucose + fructose → sucrose

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NGSS.HS-LS1-7

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