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- Question
Which of the following is the best evidence for the lock and key theory of enzyme action?
Options- A. Compounds similar in structure to the substrate inhibit enzyme activity
- B. Enzymes are found in living organisms and speed up certain reactions
- C. Enzymes speed up reactions by definite amounts
- D. Enzymes determine the direction of a reaction
- Correct Answer
- Compounds similar in structure to the substrate inhibit enzyme activity
- 1. A substrate binds to its enzyme at a location called the __________ site.
Options- A. coenzyme
- B. substrate
- C. active
- D. polypeptide Discuss
- 2. The ability of FADH to be oxidized is __________ than the ability of FAD to be oxidized.
Options- A. greater
- B. lesser
- C. approximately equal
- D. half Discuss
- 3. In the reaction, C6H12O6 + 6O2 ? 6CO2 + 6H2O + energy, which component is being reduced?
Options- A. O2
- B. CO2
- C. H2O
- D. Energy Discuss
- 4. About 7.3 kcal/mole are released when
Options- A. glucose is converted to CO2 and H2O
- B. NAD+ is reduced to NADH
- C. ATP hydrolysis is coupled to sucrose synthesis
- D. the terminal phosphate bond of ATP is broken by hydrolysis Discuss
- 5. The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be __________ than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.
Options- A. greater
- B. lesser
- C. approximately equal
- D. half Discuss
- 6. The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.
Options- A. greater
- B. lesser
- C. approximately equal
- D. half Discuss
- 7. Hydrogen and oxygen release enormous amounts of energy when they react. Yet, hydrogen and oxygen can be mixed together in a balloon and nothing will happen. Why?
Options- A. Competitive inhibitors are blocking the reaction from occurring in the active site
- B. There must be contaminating elements in the balloon that prohibit the reaction from occurring
- C. The energy of activation to form the transition-state complex is too high to allow the reaction to occur without assistance
- D. all of the above Discuss
- 8. The ability of Vibrio fischeri to convert chemical energy directly into radiant energy in bioluminescence is an example of __________ at work.
Options- A. Shelford's law of tolerance
- B. Leibig's law of the minimum
- C. the first law of thermodynamics
- D. the third law of thermodynamics Discuss
- 9. Reduction is the
Options- A. loss of proton
- B. gain of electron
- C. loss of electron
- D. gain of protons Discuss
- 10. The fact that ?-oxidation of fatty acids, occurs in the mitochondria whereas fatty acid synthesis occurs in the cytoplasmic matrix, is an example of regulation of enzymatic activity by the __________ mechanism.
Options- A. compartmentation
- B. induction
- C. competitive inhibition
- D. repression Discuss
Enzyme Reaction problems
Search Results
Correct Answer: active
Correct Answer: greater
Correct Answer: O2
Correct Answer: glucose is converted to CO2 and H2O
Correct Answer: lesser
Correct Answer: greater
Correct Answer: Competitive inhibitors are blocking the reaction from occurring in the active site
Correct Answer: the first law of thermodynamics
Correct Answer: gain of electron
Correct Answer: repression
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