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- 1. Multiple ChoiceA catalyst works bychanging the order of the reactionincreasing the temperaturelowering the activation energymaking the activated complex
- 2. Multiple ChoiceEndergonic reactions require:an input of energya release of energydo not change energy
- 3. Multiple Choice
The active site of an enzyme can:
bind allosteric regulators.
bind competitive inhibitors.
bind non-competitive inhibitors.
change the Gibbs Free Energy of the reaction.
- 4. Multiple Choice
The break down of larger molecules into small one.
metabolism
catabolism
anabolism
oxidation
- 5. Multiple Choice
sum of all chemical reactions
chemosynthesis
cellular respiration
metabolism
photosynthesis
- 6. Multiple Choice
What is being represented by the letter B in the image?
Substrate
Enzyme
reactants
Product
- 7. Multiple ChoiceSuccinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. What is malonic acid's role with respect to succinate dehydrogenase?It is a competitive inhibitor.It is an allosteric regulator.It is able to bind to succinate.It blocks the binding of fumarate.
- 8. Multiple ChoiceThe place, other than the active site, where activators and inhibitors bind to an enzyme is called the ________ site.competitiveallostericalteriorrate
- 9. Multiple ChoiceIf a process is spontaneous, what can be said about the Gibbs Free Energy of the process?ΔG is negativeΔG is positiveΔG is zero
- 10. Multiple Choice
Increasing the substrate concentration in an enzymatic reaction could overcome which of the following?
denaturation of the enzyme
allosteric inhibition
competitive inhibition
saturation of the enzyme activity
- 11. Multiple Choice
Some of the drugs used to treat HIV patients are competitive inhibitors of the HIV reverse transcriptase enzyme. Unfortunately, the high mutation rate of HIV means that the virus rapidly acquires mutations with amino acid changes that make them resistant to these competitive inhibitors. Where in the reverse transcriptase enzyme would such amino acid changes most likely occur in drug-resistant viruses?
in or near the active site
at an allosteric site
at a cofactor binding site
in regions of the protein that determine packaging into the virus capsid
- 12. Multiple Choice
Which of the following in Figure 6.4 would be the same in either an enzyme-catalyzed or a noncatalyzed reaction?
a
b
c
d
- 13. Multiple Choice
Which of the following represents the activation energy needed for the enzyme-catalyzed reverse reaction, C + D → A + B, in Figure 6.4?
a
b
c
d
- 14. Multiple ChoiceWhich of the following are products of the light reactions of photosynthesis that are utilized in the Calvin Cycle?CO2 and glucoseATP and NADPHADP, P and NADP+H2Oand O2
- 15. Multiple ChoiceWhen oxygen is released as a result of photosynthesis, it is a direct by-product of____reducing NADP+splitting water moleculeschemiosmosiselectron transfer in photosystem 1
- 16. Multiple ChoiceWhat is the main role of the pigment molecules in a light-harvesting complex in the thylakoid membranes?split water and release oxygen to te reaction-center chloropylltransfer light energy to the reaction-center chlorophyllsynthesize ATPtransfer electrons to NADPH
- 17. Multiple ChoiceWhich of the following processes could still occur in a chloroplast in the presence of an inhibitor that prevents H+ from passing through ATP synthasecomplexes?photophosphorylationCalvin cycleoxidation of NADPHgeneration of proton-motive force
- 18. Multiple ChoiceWhich of the following processes is most directly driven by light energy?carbon fixation in stromareduction of NADP moleculesATP Synthesisremoval of electrons from membrane-bound chlorophyll molecules
- 19. Multiple ChoiceThe color of light least effective in driving photosynthesis is _________blueredorangegreen
- 20. Multiple ChoiceA weightlifter is using heavy weights in short bursts for a competition. Because his muscle cells are not able to take in enough oxygen to make very much ATP the weightlifter begins to get fatigue in his muscles. Which of the following processes is most likely going on in the muscles of the weightlifter as he competes in his event?As the cells run out of oxygen they switch to anaerobic respiration, which allows the cell to make small amounts of ATP in the absence of oxygen.As the cells run out of oxygen, they die off gradually and the weightlifter's muscles have fewer contracting muscle cells.The cells will never run out of oxygen if the weightlifter is breathing.As the cells run out of oxygen, they will continue to make the same amount of ATP, since oxygen is not required to make ATP.
- 21. Multiple ChoiceWhich process takes place in the presence of oxygen and produces nearly 20 times as much as ATP as glycolysis alone?photosynthesislactic acid fermentationaerobic respirationalcoholic fermentation
- 22. Multiple ChoiceWhich process takes place in the presence of oxygen and produces nearly 20 times as much as ATP as glycolysis alone?photosynthesislactic acid fermentationaerobic respirationalcoholic fermentation
- 23. Multiple ChoiceTwo different species of bacteria are examined. Scientists find that species X always produces CO2 and H2O during cellular respiration. Species Y always produces ethyl alcohol and CO2. Which conclusion can be made from these observations?Only species Y is aerobic.Only species Y is anaerobicBoth species X and Y are aerobic.Both species X and Y are anaerobic.
- 24. Multiple ChoiceWhere does glycolysis occur?Inner mitochondrial membraneMitochondrial MatrixCytosolAt a ribosome
- 25. Multiple ChoiceNADH is a ______ form of NAD+.ReducedOxidizedCatabolizedHydrolized
- 26. Multiple Choice
How many ATP are gained (net) through glycolysis?
0
2
4
30-38
- 27. Multiple ChoiceWhat enzyme in the ETC is responsible for generating the ATP molecules?ATPaseATP synthaseHexokinasenone of the above
- 28. Multiple ChoiceEach NADH molecule carrying hydrogen to the ETC can produce a maximum of _ molecules of ATP?1234
- 29. Multiple Choicesite of the krebs cycle1234
- 30. Multiple ChoiceWhere do the light-dependent reactions occur?thylakoid membranestromamesophyllmitochondria
- 31. Multiple ChoiceWhat is the function of NADP+?It absorbs lightIt is an electron carrierIt is a light-reflecting pigmentIt acts as long-term energy storage
- 32. Multiple ChoiceThe enzyme responsible for Carbon Fixation in C3 Photosynthesis isRuBisCoPEP CarboxylaseHexokinasePyruvate DeHydrogenase
- 33. Multiple ChoiceWhich of the following molecules is not needed for the Calvin Cycle?CO2ATPNADPHH2O
- 34. Multiple ChoiceGreen plants reflect ________ light.RedGreenAllRed and Violet
- 35. Multiple ChoiceWhere does the carbon come from that is used to form glucose?The soilCO2 in the airFrom other carbohydratesCalvin Cycle
- 36. Multiple ChoiceThe main source of energy for all life comes from ____.the Earththe moonthe sunthe food we eat/make
- 37. Multiple ChoiceWhere does carbon dioxide enter plantsThe leavesStomataRootsStem
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