Respiration 1 (MJC)

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frozespot171
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144119
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Respiration 1 (MJC)
Updated:
2012-03-29 22:59:44
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MJC Respiration
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Respiration
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  1. What happens to reduced NAD and molecular oxygen in cellular respiration?


    1) Reduced NAD acts as an oxidising agents in glycolysis while oxygen combines with glucose to produce CO2
    2) Reduced NAD is oxidized in mitochondrial ATP formation while oxygen combines with carbon to produce CO2
    3)Reduced NAD combines with succinic acid as part of the Krebs cycle while oxygen combines with carbon to produce CO2
    4) Reduced NAD is oxidized in mitochondrial ATP formation while oxygen combines with hydrogen to produce H2O
    4) Reduced NAD is oxidized in mitochondrial ATP formation while oxygen combines with hydrogen to produce H2O
  2. Which statement about chemiosmosis is not true?

    1) The main protein complexes of the electron transport chain in mitochondria pump protons out into the intermembrane space
    2) A central role is played by a proton gradient that exists across the inner mitochondrial membrane
    3) The pH inside the mitochondrial matrix is less than that in the cell cytoplasm
    4) The electrochemical ‘force’ which drives the synthesis of ATP is called the proton-motive force.
    3) The pH inside the mitochondrial matrix is less than that in the cell cytoplasm
  3. In the complete oxidation of one molecule of glucose, approximately what percentage of ATP is formed via link reaction?

    1) 0%
    2) 10%
    3) 90%
    4) 100%
    1) 0%
  4. The diagram shows the reversible conversion of pyruvate to lactate by the enzyme lactate dehydrogenase.

    What would the effect of inhibition of lactate dehydrogenase in a mammalian cell under anaerobic conditions?
    1) A decrease in glycolysis due to lack of NAD
    2) A decrease in cell pH due to the accumulation of lactic acid
    3) An increase in ATP production due to increased amounts of reduced NAD
    4) An increase in the activity of the Krebs cycle due to increased amount of pyruvate.
    1) A decrease in glycolysis due to lack of NAD
  5. Which of the following shows the correct yield of products formed during respiration of one glucose molecules?

    1) 2 reduced NAD and 4 ATP from glycolysis
    2) 2 reduced FAD from link reaction
    3) 6 reduced FAD, 2 reduced NAD and 4 ATP from Krebs cycle
    4) 38 ATP from oxidative phosphorylation
    1) 2 reduced NAD and 4 ATP from glycolysis
  6. On complete oxidation, one mole of glucose gives rise to ____ moles of carbon dioxide.

    1) 2
    2) 3
    3) 4
    4) 6
    2) 3
  7. Which of the following releases the most energy during respiration?

    1) Alcoholic fermentation which involves the conversion of glucose to ethanol
    2) Lactate fermentation where pyruvate is reduced to lactate.
    3) Phosphorylation of glucose
    4) Oxidation of pyruvate to carbon dioxide and water
    4) Oxidation of pyruvate to carbon dioxide and water
  8. The electron transport chain in cells is directly coupled with the
    1) polymerisation of hexoses
    2) reduction of FAD
    3) lactate fermentation
    4) synthesis of ATP
    4) synthesis of ATP
  9. Glycolysis requires enzymes in order to carry out its reactions such as substrate level phosphorylation. Where are these enzymes found?

    1) Outer membrane of the mitochondrion
    2) Inner mitochondrial space
    3) Cristae of the mitochondrion
    4) Cytosol
    4) Cytosol
  10. Which molecule is common to both glycolysis and the Calvin cycle?

    1) hexose phosphate
    2) NADP
    3) ATP
    4) carbon dioxide
    3) ATP
  11. What causes the formation of lactate in muscle tissues undergoing strenuous contractions?

    1) low concentration of glucose
    2) high concentration of carbon dioxide
    3) high concentration of water
    4) low concentration of oxygen
    4) low concentration of oxygen
  12. What is the precise role of oxygen in respiration?

    1) To combine with carbon from carbohydrates to form carbon dioxide
    2) To oxidize reduced NAD in oxidative phosphorylation
    3) To combine with acetyl coenzyme A to form citrate in the Krebs cycle.
    4) To act as a final electron and hydrogen acceptor in oxidative phosphorylation
    4) To act as a final electron and hydrogen acceptor in oxidative phosphorylation
  13. The final output of the Krebs cycle includes all of the following except

    1) NAD
    2) Reduced FAD
    3) ATP
    4) Carbon dioxide
  14. What substance is regenerated by lactate fermentation?

    1) Oxygen
    2) NAD
    3) ATP
    4) Acetyl-CoA
    2) NAD
  15. NADH is produced during

    1) glycolysis
    2) link reaction
    3) Krebs cycle
    4) All of the above
    4) All of the above

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