Enzymes

In an enzyme reaction, the __________ ________ is a temporarily stable chemical species

Enzymes are biological ________ that speed up chemical reactions in living organisms

The amount of energy needed for a reaction to occur is called the _________?

Which of the following are NOT an advantage of a biological catalyst over an inorganic catalyst?

• Less reaction specificity

• Milder reaction conditions

• Higher reaction rates

• Capacity for regulation

Explain how an enzyme works using the following words: enzyme, substrate, product, active site, activation energy and coenzyme.

What does an enzyme do?

• Decreases the activation energy of a reaction

• Increases the activation energy of a reaction

• Does not change the activation energy of a reaction

• Makes the reaction last longer

Which enzyme did you learn about that is an example of metal ion catalysis?

What are the three functional groups present in a catalytic triad?

Which of the following is true of the binding energy derived from enzyme-substrate interactions?

• Most of it is used up simply binding the substrate to the enzyme.

• Most of it is derived from covalent bonds between enzyme and substrate.

• It is sometimes used to hold two substrates in the optimal orientation for reaction.

• It cannot provide enough energy to explain the large rate accelerations brought about by enzymes.

Which of these statements about enzyme-catalysed reactions is false?

• At saturating levels of substrate, the rate of an enzyme-catalysed reaction is proportional to the enzyme concentration.

• If enough substrate is added, the normal Vmax of a reaction can be attained even in the presence of a competitive inhibitor.

• The rate of a reaction decreases steadily with time as substrate is depleted.

• The activation energy for the catalysed reaction is the same as for the uncatalysed reaction, but the equilibrium constant is more favourable in the enzyme-catalysed reaction.