Quiz 6: Enzymes

1.T/F: Changes in temperature, pH, salt and ion concentrations can change the shape of an enzyme’s active site. true / false

Answer: true

2. Circle one: Hydration / Hydrolysis / Dehydration / Dehydrolysis results in the synthesis of larger molecules from smaller ones through the removal of water.

Answer: Dehydration

3. T/F: Enzymes are inorganic catalysts made of protein or DNA. true / false

Answer: false (organic, protein or RNA)

4. Circle twice: Enzymes are needed in hefty / small / moderate / indeterminate quantities because they do not themselves hydrolyze / rapidly dehydrate / physically obviate / synthesize / chemically change during a reaction in which they serve as catalysts.

Answer: small / chemically change

5. Which of the following best describes the relationship between sucrose and sucrase in today’s lab: a. The more sucrase I add to a solution, the faster the reaction b. The more sucrose I add, and the greater molarity of the solution, the faster the reaction c. Up to a certain point only, the more sucrose I add, the faster the reaction d. Hydrolysis that it cannot be facilitated by enzyme action

Answer: c; this question tests your understanding of the substance saturation concept

6. Fill in the Blank: The ______________________ of a reaction fits into the active site of an enzyme like a key fits into a lock.

Answer: substrate

7. Fill in the Blank: The enzyme that breaks down the disaccharide maltose is probably called ______________

Answer: maltase

8. In this lab, we will obtain the enzyme ________________ from living __________ cells.

Answer: sucrase / yeast

9. The __________________________ test gives us a pretty good idea of the speed of conversion of sucrose into its two constituent parts

Answer: Benedict