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- 1. Multiple Choice
How do enzymes speed up chemical reaction?
Increasing activation energy
Decreasing activation energy
Increasing deactivation energy
Decreasing deactivation energy
- 2. Multiple Choice
Which of the following conclusions can be drawn from this graph?The optimum pH of the enzyme is 6.6.The optimum pH of the enzyme is 5.8The enzyme’s activity increases as pH increases 5.0 to 9.0The enzyme’s activity is greater around pH of 8.0 . - 3. Multiple ChoiceAny substance that is acted upon by an enzyme is called a(n)?CoenzymeSubstrateVitaminPolypeptide
- 4. Multiple ChoiceBased on the graph, what is the optimal temperature for this enzyme?15oC40oC30oC35oC
- 5. Multiple ChoiceWhat happens when enzymes are heated to a high temperature?The enzymes die.The shapes of the enzyme are altered denatureThe enzymes' amino acid sequence changes.The enzymes remain the same
- 6. Multiple ChoiceLetter B...active siteenzymesubstrateproducts
- 7. Multiple ChoiceLetter C...active siteenzymessubstrateproducts
- 8. Multiple ChoiceWhich of these is not a way that enzymes lower activation energy?brings molecules close togetherreaction in smaller stepsInduced-fit ensuring substrates brought in correct sequenceHeats up the reaction to provide more kinetic energy
- 9. Multiple ChoiceWhere does a competitive inhibitor bind?In the active siteNear the active siteAnywhere except the active site
- 10. Multiple ChoiceWhere does a non-competitive inhibitor bind?In the active siteNear the active siteAnywhere except the active site
- 11. Multiple ChoiceWhy does increasing the substrate concentration further will have no effect beyond a certain point?The active sites will be saturated so no more enzyme-substrate complexes can be formedThe reaction has endedToo many molecules slows the reactionThe enzymes become denatured
- 12. Multiple ChoiceAccording to the graph, at which pH do all three enzymes show some activity?25811
- 13. Multiple Choice
The red line shows...
A chemical reaction without an enzyme
A chemical reaction with an enzyme
A chemical reaction with 5 enzymes
A chemical reaction with 17 enzymes
- 14. Multiple Choice
The blue line shows...
A chemical reaction without an enzyme
A chemical reaction with an enzyme
A chemical reaction with 5 enzymes
A chemical reaction with 17 enzymes
- 15. Multiple Choice
What does the red arrow represent?
Activation energy
Deactivation energy
Total amount of energy in a cell
Energy released
- 16. Multiple ChoiceWhich of these is NOT true?Enzymes can denature (change shape) when the temperature gets too high.Enzymes can only be used once in a chemical reaction.Extreme pH can denature enzymes.Enzymes speed up chemical reactions.
- 17. Multiple ChoiceChemical reaction that requires energy input (heat, light, or electricity) in order to proceed.exothermic reactionexergonic reactionendothermic reactionendergonic reaction
- 18. Multiple ChoiceIs this reaction endergonic or exergonic?ExergonicEndergonic
- 19. Multiple ChoiceIs this reaction endergonic or exergonic?ExergonicEndergonic
- 20. Multiple Choice
Free energy is released from ATP when
a phosphate group is added
adenine bonds to ribose
ATP is exposed to sunlight
a phosphate group is removed
- 21. Multiple ChoiceWhat are the parts of the ATP molecule?adenine, thylakoids, stromastroma, grana, chlorophylladenine, ribose, phosphate groupsNADH, NAHPH, FADH
- 22. Multiple ChoiceThe process of breaking down large moleculesAnabolismCatabolismDehydrationSynthesis
- 23. Multiple ChoiceWhat does an exergonic reaction do with energy?Releases EnergyStores Energy
- 24. Multiple Choice
Assume that the reaction has a ΔG of –5.6 kcal/mol. Which of the following would be true?
The reaction could be coupled to power an exergonic reaction with a ΔG of +8.8 kcal/mol.
The reaction could be coupled to power an endergonic reaction with a ΔG of +6.2 kcal/mol.
The reaction would result in a decrease in entropy ( S) and an increase in the total energy content (H) of the system.
The reaction could be coupled to power an endergonic reaction with a ΔG of +4.9 kcal/mol.
- 25. Multiple ChoiceIf the delta G of a reaction is negative, which response shows the best conclusion for that reaction?The reaction will release more energy than was needed to form the reaction.Energy from the reaction can be used to do work.Energy is absorbed by the reaction which then can be used to power other reactions.Energy is absorbed within the reaction and distributed unevenly throughout the molecule.
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