Feedback for Multiple Choice Quiz 15

  1. The incorrect answers are true. Enzymes lower the activation energy of reactions. They do not provide the energy.

  2. The "temporary association" can be measured as the turnover number of the enzyme, kcat/[enzyme]. This is usually in the range of 10-10,000 substrate molecules/sec.

  3. The four incorrect answers are wrong for more than four reasons! How many can you count?

  4. The only substantial difference is that enzymes catalyze reactions. In fact it is now possible to (genetically) engineer antibodies so that they have known and novel catalytic activities. These catalytic antibodies are referred to as, "Abzymes".

  5. The only substantial difference is that enzymes catalyze reactions. In fact it is now possible to (genetically) engineer antibodies so that they have known and novel catalytic activities. These catalytic antibodies are referred to as, "Abzymes".

  6. Refer to Fig. 6.1 for a summary of these important energy relationships.

  7. 6. Serine proteases are a good example of enthalpic stablization (interaction between oxyanion and enzyme) as well as pre-ordering of functional groups. Favourable interaction with the substrate can increase the energy difference between the initial [ES] complex and [EX], actually decreasing the rate!
  All of the correct answers have a green check mark.
  Incorrect answers have the "red-lit" button next to your choice.