Enzyme Reaction problems
- 1. If the free energy change (?G) in a reaction is a negative value, it indicates that the
Options- A. reaction releases energy
- B. reaction absorbs energy
- C. reaction is in negative direction
- D. reaction is in positive direction Discuss
Correct Answer: reaction releases energy
- 2. Oxidation is the
Options- A. loss of proton
- B. gain of electron
- C. loss of electron
- D. gain of protons Discuss
Correct Answer: loss of electron
- 3. An enzyme that is always produced, regardless of the presence of substrates or the end products, is called
Options- A. a constitutive enzyme
- B. an isoenzyme
- C. a repressible enzyme
- D. an allosteric enzyme Discuss
Correct Answer: a constitutive enzyme
- 4. 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
Correct Answer: lesser
- 5. 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
Correct Answer: glucose is converted to CO2 and H2O
- 6. In the reaction, C6H12O6 + 6O2 ? 6CO2 + 6H2O + energy, which component is being reduced?
Options- A. O2
- B. CO2
- C. H2O
- D. Energy Discuss
Correct Answer: O2
- 7. 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
Correct Answer: greater
- 8. A substrate binds to its enzyme at a location called the __________ site.
Options- A. coenzyme
- B. substrate
- C. active
- D. polypeptide Discuss
Correct Answer: active
- 9. 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 Discuss
Correct Answer: Compounds similar in structure to the substrate inhibit enzyme activity
- 10. 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
Correct Answer: greater
More in Microbiology:
Programming
Copyright ©CuriousTab. All rights reserved.