B.9(C) Ezymes

The function of an enzyme in biochemical reaction is to

• raise the temperature of the system

• speed up the rate of the reaction

• increase the amount of substrate added

• change the type of product formed

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A model of an enzyme and its corresponding substrate is shown. Which model best represents the molecules at the end of

the reaction?

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For an enzyme to be able to catalyze a reaction, the active site must

• be occupied by an inhibitor

• increase the activation energy level

• have a complementary shape to the substrate

• cause the enzyme to be destroyed in the reaction

Enzymes are proteins that have a three-dimensional shape that is specific to a particular

substrate. Environmental conditions can change the shape of the protein. What is the most likely result if the shape of the enzyme changes?

• The substrate will change its shape to match the enzyme.

• The enzyme will no longer be able to catalyze the reaction with the substrate.

• The products made from the enzyme and the substrate will be changed.

• The enzyme will be able to bind to more diverse substrates than before.

The graphs show the reaction rate for an enzyme across a range of temperatures and pH. Based on these data, this enzyme functions best at what temperature and pH?

D Temperature of 50°C and a pH of 10

• Temperature of 27°C and a pH of 4

• Temperature of 37°C and a pH of 6

• Temperature of 40°C and a pH of 8

• Temperature of 50°C and a pH of 10

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NGSS.HS-PS1-5