Campbell 8.4 - 8.5 Quiz
20 Questions
| Total Attempts: 229
.
Questions and Answers
- 1.Explain Fig. 8.13 in your own words. Be sure to highlight ALL starred portions discussed in class.
- 2.Describe the main idea of the first paragraph on p.155 on the topic of how substrate concentration affects reaction rate when an enzyme is present.
- 3.The name of the enzyme shown in the very first diagram in 8.4 is ____________________. (the diagram showing the hydrolysis of sucrose).
- 4.The reaction profiled in Fig. 8.12 must be an ___________________ reaction since it has a negative deltaG.
- 5.Molecule C-D is a reactant of the reaction shown in Fig. 8.12.
- A.
True
- B.
False
- 6._________________________ is the energy needed to start a reaction.
- 7.The size of the activation energy will determine the rate of a reaction since it determines how much energy investment is needed for the reaction to proceed.
- A.
True
- B.
False
- 8.Enzymes cannot change the deltaG of a reaction - they can only speed a reaction that would occur anyway.
- A.
True
- B.
False
- 9.Enzymes are extremely specific to their ________________ because of their precise 3-D (tertiary) shapes. Even very similar molecules will not fit into an enzyme's active site.
- 10.Check any of the following that WOULD change if a reaction proceeded with vs. without an enzyme.
- A.
Reactants
- B.
Products
- C.
Ea
- D.
DeltaG (free energy change)
- E.
Rate of reaction
- 11.The _____________________ is the precise place on an enzyme that a substrate will bind.
- 12.Every enzyme has an _________________ temperature and pH at which its 3D shape is most perfect and therefore at which it works best.
- 13.Check any of the following that are disrupted if the temperature of a reaction gets TOO hot.
- A.
Hydrogen bonds
- B.
Covalent bonds
- C.
Van der waals interactions
- D.
Ionic bonds
- 14.Initially, raising the temperature of an enzyme-catalyzed reaction slightly will speed the reaction rate because it causes more _______________ between enzymes and substrates as the molecules move around more.
- 15.See Fig. 8.16 A. The difference between the optimal temperature of a typical human enzyme and that of a thermophilic bacteria is ________ degrees Celcius.
- 16.See Fig. 8.16 B. Pepsin works best at basic pHs and trypsin works best at acidic pHs.
- A.
True
- B.
False
- 17._______________________, like vitamins, can bind to enzymes and help them to work.
- 18.An ___________________ would be like the opposite of a cofactor since it would bind to an enzyme and DECREASE its ability to function.
- 19.____________________ inhibitors bind in the active site of the enzyme and therefore prevent the substrate from binding.
- 20._____________________ inhibitors don't bind in the active site - they bind to another place on the enzyme that causes its 3D shape to change and therefore prevents the substrate from binding.
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