Enzymes and Chemical Reactions Quiz

Chemical reactions that absorb more energy than they release are called _______________.

• endothermic

• anabolic

• photosynthetic

• exothermic

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Energy is released from an ATP molecule when it

• stores an extra phosphate group.

• converts a phosphate group to ADP.

• produces a sugar molecule.

• loses a phosphate group.

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Which structures pictured would make up an ATP molecule?

• A, B, and C

• C and D

• A, B, C, and D

• A and B Only

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Number #2 represents the molecule that the enzyme binds to which is called _____.

• substrate

• products

• enzyme

• active site

In what way could you increase the rate of reaction in the image as it is taking place in letter C?

• add more enzyme

• remove enzyme

• change the shape of the enzyme by denaturing

• add more substrate

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In the graph, which of the following could be used to increase the reaction beyond C?

• Increase the amount of substrate

• Increase the temperature

• Decrease enzyme reaction

• Increase temperature and substrate

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Enzymes __________ a chemical reaction by __________ the activation energy.

• slow down, increasing

• speed up, lowering

• stop, maintaining

• reverse, raising

In the picture below, C and D represent the __________.

• reactants

• products

• catalysts

• inhibitors

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Pepsin, a common enzyme found in the stomach, is most active at pH values between 0.5 and 2.5. It works slowly between pH values of 2.6 and 3.4. Beyond a pH of about 3.5, it becomes completely inactive. Why does this happen?

• The enzyme is denatured, changing its active site needed for binding to specific substrates.

• The enzyme is enhanced, increasing its active site for binding to specific substrates.

• The enzyme is stabilized, maintaining its active site for binding to specific substrates.

• The enzyme is replicated, doubling its active site for binding to specific substrates.

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

• from carbohydrates like glucose

• from proteins

• from fats

• from vitamins

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