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- 1. Multiple ChoiceA molecule becomes more oxidized when itgains a H+ iongains an electronlooses an electronlooses a H+ ion
- 2. Multiple ChoiceMost of the ATP produced in cellular respiration come from which of the following processes?oxidative phosphorylationreduction of NADHglycolysisthe citric acid cycle
- 3. Multiple ChoiceThe function of cellular respiration is to ______.extract CO2 from the atmosphereproduce carbohydratesharvest usable energy from glucosesynthesize macromolecules from monomers.
- 4. Multiple ChoiceDuring the reaction C6H12O6 + 6 O2 → 6 CO2 + 6 H2O, which compound is reduced as a result of the reaction?carbon dioxideoxygenwaterglucose
- 5. Multiple ChoiceEach ATP molecule contains about 1% of the amount of chemical energy available from the complete oxidation of a single glucose molecule. Cellular respiration produces about 32 ATP from one glucose molecule. What happens to the rest of the energy in glucose?It is converted to starchit is released as carbon dioxide and waterit is converted to heatit is used to make water from hydrogen ions and oxygen
- 6. Multiple ChoiceWhich of the following statements is the best explanation of what happens to the temperature and carbon dioxide concentration during a one-hour class period in a classroom of 300 students if the heating and air conditioning is turned off and all doors are kept closed?Temp up CO2 upTemp down CO2 upTemp up CO2 downTemp down CO2 down
- 7. Multiple ChoiceWhere do the reactions of glycolysis occur in a eukaryotic cell?mitochondrial matrixinner membrane of the mitochondrionintermembrane space of mitochondrioncytosol
- 8. Multiple ChoiceWhich process is the one in which glucose is oxidized to generate two molecules of pyruvate, and in which ATP and NADH are produced?citric acid cyclepyruvate oxidationfermentationnone of the above
- 9. Multiple ChoiceIn glycolysis, there is no production of carbon dioxide as a product of the pathway. Which of the following is the best explanation for this?The products of glycolysis have the same number of carbon atoms as the starting material.There is little ATP produced in glycolysis.There is no oxidation or reduction reactions in glycolysis to produce the CO2Glucose contains more carbons that the number of carbons found in the pyruvate products that are produces by clycolysis.
- 10. Multiple ChoiceMost of the NADH that delivers electrons to the electron transport chain comes from which of the following processes?anabolic pathwaysglycolysiscitric acid cycleoxidative phosphorylation
- 11. Multiple ChoiceIn an experiment, mice were fed glucose (C6H12O6) containing a small amount of radioactive oxygen. The mice were closely monitored, and after a few minutes radioactive oxygen atoms showed up in __________.carbon dioxideoxygen gasATPwater
- 12. Multiple ChoiceWhy is the citric acid cycle called a cycle?NADH is cycled down the electron transport chainThe aceytal CoA that enters the cycle is regenerated in the last step of the pathway.NAD+ and FAD are recycledThe four-carbon acid that accepts the acetyl CoA in the first step of the cycle is regenerated by the last tstep of the cycle
- 13. Multiple ChoiceWhere do the reactions of the citric acid cycle occur in eukaryotic cells?the matrix of the mitochondrionthe cytosolthe intermembrane space of the mitochondrionthe cristae of the mitochondrion
- 14. Multiple ChoiceHow many molecules of ATP are gained by substrate-level phosphorylation from the complete breakdown of a single molecule of glucose in the presence of oxygen?24about 1632
- 15. Multiple ChoiceWhich of the following represents the major (but not the only) energy accomplishment of the citric acid cycle?utilization of O2formation of CO2formation of NADH and FADH2formation of ATP
- 16. Multiple ChoiceWhich part of the catabolism of glucose by cellular respiration requires molecular oxygen (O2) and produces CO2?glycolysiscitric acid cyclethe combination of the citric acid cycle and electron transport chainthe combination of glycolysis and the citric acid cycle
- 17. Multiple ChoiceWhich of the following substances is/are involved in oxidative phosphorylation?ADPoxygenATPAll of the above
- 18. Multiple ChoiceWhich of the following best describes the electron transport chain?hydrogen atoms are added to CO2 to make an energy rich compoundelectrons are passed from one carrier to another, releasing a little energy in each stepglucose is broken down into a three-carbon compound in preparation for the citric acid cycleacetyl CoA is fully oxidized to CO2
- 19. Multiple ChoiceIf a compound that allows protons to freely diffuse across membranes is added to cells that are actively metabolizing glucose via cellular respiration, which of the following processes would stop?electron transportATP synthesisglycolysisnone of the listed responses are correct
- 20. Multiple ChoiceWhich of the following is the source of the energy that produces the chemiosmotic gradient in mitochondria?an ATP-dependent proton pumpelectrons moving down the electron transport chainthe production of NADHATP
- 21. Multiple ChoiceDuring respiration in eukaryotic cells, the electron transport chain is located in or on the __________.inner membrane of the mitochondrionmatrix of the mitochondrioncytosolintermembrane space of the mitochondrion
- 22. Multiple ChoiceFermentation is essentially glycolysis plus an extra step in which pyruvate is reduced to form lactate or alcohol and carbon dioxide. This last step __________.enables the cell to make pyruvate into substances it can useremoves poisonous oxygen from the environmentextracts a bit more energy from glucoseenables the cell to recycle the reduced NADH to oxidized NAD+
- 23. Multiple ChoiceSports physiologists at an Olympic training center wanted to monitor athletes to determine at what point their muscles were functioning anaerobically. They could do this by checking for a buildup of which of the following compounds?ADPATPcarbon dioxidelactate
- 24. Multiple ChoiceIn glycolysis in the absence of oxygen, cells need a way to regenerate which compound?ethanolcarbon dioxidelactateNAD+
- 25. Multiple ChoiceMuscle tissues make lactate from pyruvate to do which of the following?utilize the energy in pyruvateregenerate NAD+get rid of pyruvate produced by glycolysisspeed up the rate of glycolysis
- 26. Multiple ChoiceIf muscle cells in the human body consume O2 faster than it can be supplied, which of the following is likely to result?The muscle cells will have more trouble making enough ATP to meet their energy requirements.The cells will not be able to carry out oxidative phosphorylationthe cells will consume glucose at an increased rateAll answers are correct.
- 27. Multiple ChoiceOf the metabolic pathways listed below, which is the only pathway found in all organisms?glycolysisfermentationthe citric acid cyclecellular respiration
- 28. Multiple ChoiceFats enter cellular respiration through a process called __________.beta oxidationlipid reductionglycerol metabolismfatty acid catabolism
- 29. Multiple ChoiceIn the overall process of glycolysis and cellular respiration, ______ is oxidized and _______ is reduced.glucose... oxygenoxygen... ATPglucose... ATPATP... oxygen
- 30. Multiple ChoiceDuring aerobic respiration, molecular oxygen (O2) is used for which of the following purposes?as a source of O2 in every reaction that produces CO2at the end of the ETC to accept electrons and form H2Oat the end of glycolysis to oxidize pyruvateat the end of the citric acid cycle to regenerate citric acid
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