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2010-12-14 17:59:43
CEll bio Exam2

CEll bio, Exam2
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  1. Which of these is part of the cell membrane?
  2. How do fat soluble molecules normally get into the cell?
    --They dissolve in the fat layers of the membrane and enter the cell by diffusion
  3. The phospholipids are unusual molecules because?
    • -They have hydrophilic regions.
    • -They have hydrophobic regions
  4. Which statement best describes the �Fluid Mosaic Model� of the structures of the cell membrane?
    --a double layer of lipid molecules with protein molecules suspended in the layer
  5. The movement of chloride ions from an area where chloride is concentrated to an area where chloride is less concentrated is what?
  6. If a cell has a solute concentration of 0.07% which of the solutions would be hypotonic in the cell?
    --0.01% solute
  7. Which of the following is necessary in order for osmosis to occur?
    --A semi-permeable membrane
  8. What is an example of a passive transport mechanism?
    • --osmosis
    • --diffusion
  9. In an isotonic solution there will be?
    --no net movement of water
  10. The sodium potassium pump (which carries sodium out of a cell and potassium into cells) is an example of?
    --active transport
  11. The process of a cell engulfing a solid object is:
  12. What is likely to happen when a plant cell is place in pure water?
    --it becomes turgid
  13. When a cell bursts due to osmosis, it is in a solution that is:
  14. Why do plant cells behave differently then animal cells when places in a hypotonic solution?
    --Plants have a cell wall
  15. ADP + inorganic phosphate ?
  16. The net yield of ATP in glycolysis (ATP/glucose) in the presence of arsenate (AsO4 2- ) instead of phosphate is?
    -- (-2)
  17. The regulation of the glycolytic pathway involves?
    • --feedback by ATP
    • --Allosteric inhibition by ATP
    • --Allosteric stimulation by ADP
  18. Phosphoructosekinase, the major flux-controlling enzyme of glycolysis is allosterically inhibited by __________ and activated by ______________.
    --ATP & ADP
  19. In eukaryotic cell, the enzymes of glycolsis are located in the
  20. The glycolytic pathway (Glucose? pyruvate ) is found?
    --In all living organisms
  21. The facilitated diffusion of glucose into erythrocytes uses a mechanism called?
  22. The active transport of NA+ and K+ by the membrane Na+-K+ pump uses energy from?
    --ATP hydrolysis to ADP and Pi
  23. What molecule cannot move directly through the membrane by simple diffusion?
  24. Pyruvate, then end product of glycolysis, enters the citric acid cycle after is have en converted to?
    --Acetyl CoA
  25. Most of the ATP made during cellular respiration is generated by?
    --Oxidative phosphorylation
  26. Which is not a substrate for hexokinase?
  27. What is not a potential end product of fermentation?
    • a)ethanol
    • b)pyruvate
    • c) lactate
    • d) Acetaldehyde
    • e) B& d
  28. Phosphoructosekinase (PFK-1) is allosterically regulated. Which of the following is not a regulatory effect?
    --Protons activated by PFK-1
  29. The effects f fructose-1, 6-bisphosphate on pyruvate kinase is an example of?
    --activation by phospohrylation
  30. Electrons stripped from glucose during the glycolysis and the Krebs cycle is transported to the electron transport chain by?
  31. What is given off as a by-product of cellular respiration during the conversion of pyruvic acid (a 3 carbon molecule) into acetyl-coA (a two carbon molecule?)
  32. At the end of the electron transport chain, the final acceptor of electrons is______, which produces a molecule of ______?
  33. Which of the following molecules serves as an intermediate electron carrier in the process of respiration?
    • --NAD+
    • --FAD
  34. In the first few steps o f glycolysis, two ATP molecules are actually �used up� instead of produced. Why do you think that this energy must be added to the glucose molecule first before the ultimate harvest of 36 ATP molecules can be attained?
    --Glucose is a stable molecule. A certain amount of �activation� energy must be added before the molecule will release all of its stored energy.
  35. During alcoholic fermentation, molecule of glucose will be converted in:
    --2 ethanol+ 2CO2 + 2NAD+
  36. Glycolysis takes place in the?
  37. The process of cellular respiration can be written as a chemical equation. Which is the correct equation?
    --C6H12O6 + 6O2 + ADP ? 6 CO2 + 6H2O + ATP
  38. What is a correct statement about transport across a membrane? The movement of:
    --glucose across cell membrane involves binding with a carrier protein in the membrane.
  39. Regarding the sodium, potassium pump:
    • --energy from ATP is directly used to move the sodium and potassium
    • --More sodium ions are pumped into the cell and potassium ions are pumped out.
  40. The enzyme that catalyses the conversion of succinate to fumarate is?
    --fumarate hydrase
  41. When isocitrate (6 carbons) is converted to alpha-ketogluterate, the subproduct (s) of the reaction is/are:
    --A molecule of CO2 and a molecule of NADH are produced
  42. The Krebs cycle is also known as the TCA cycle because:
    --Citrate contains three carboxylic acid groups.
  43. The electron transport system consists of five kinds of carriers. Chemically speaking they are:
    --all proteins except Q�which is a lipid.
  44. The enzyme pyruvate dehydrogenase is negatively regulated (inhibited) by:
    • --Acetyl CoA
    • --NADH
    • --ATP
  45. The enzyme hexokinase is inhibited by: