Discussion
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- Question
Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to
Options- A. L-tryptophan
- B. D-L-tryptophan hydantoin
- C. L-serine
- D. pyruvate
- Correct Answer
- L-tryptophan
- 1. 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
- 2. Reduction is the
Options- A. loss of proton
- B. gain of electron
- C. loss of electron
- D. gain of protons Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. If the Keq for an enzymatic reaction is greater than 1, the reaction
Options- A. will be endergonic
- B. can not occur without the input of energy
- C. both (a) and (b)
- D. none of these Discuss
- 7. In the reaction, C6H12O6+ 6O2 ? 6CO2 + 6H2O + energy, which component is being oxidized?
Options- A. C6H12O6
- B. O2
- C. CO2
- D. H2O Discuss
- 8. An endergonic reaction is one that
Options- A. requires energy in order to proceed
- B. releases energy for work
- C. gives off much heat
- D. looses energy Discuss
- 9. An exergonic reaction is one that
Options- A. requires energy to proceed
- B. releases energy for work
- C. gives off much heat
- D. looses energy Discuss
- 10. To a living organism, which of the following has the greatest amount of available energy per molecule?
Options- A. ATP
- B. ADP
- C. AMP
- D. H2O Discuss
Enzyme Reaction problems
Search Results
Correct Answer: repression
Correct Answer: gain of electron
Correct Answer: the first law of thermodynamics
Correct Answer: Competitive inhibitors are blocking the reaction from occurring in the active site
Correct Answer: greater
Correct Answer: none of these
Correct Answer: C6H12O6
Correct Answer: requires energy in order to proceed
Correct Answer: releases energy for work
Correct Answer: ATP
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