LAB QUIZES FINAL

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medic11
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186184
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LAB QUIZES FINAL
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2012-12-01 21:55:53
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BI 253
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LAB QUIZ QUESTIONS
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  1. What is the energy source for photosynthesis?
    Light/solar energy
  2. What tactic do we use to separate the pigments present in leaves?
    Paper Chromatography
  3. Do senescent (autumnal) leaves contain pigments other than chlorophyll?
    Yes
  4. In plants, starch is the storage form of ____.
    Glucose
  5. In plants, gases enter & exit leaves through structures called ____.
    Stomata
  6. ____ is the process by which new cells receive exact copies of all the chromosomes of the initial cells & there is no change in chromosome #.
    Mitosis
  7. Cells w/homologous prs of chromosomes are called (diploid/haploid) cells.
    Diploid
  8. ____ is the process that produces gametes.
    Meiosis
  9. After replication, chromosomes remain attached at the ____.
    Centromere
  10. A cell w/only 1 member of each homologous pr is called a (diploid/haploid) cell.
    Haploid
  11. When RBCs are placed in a hypotonic solution they ____.
    Swell or lyse
  12. When RBCs are placed in a hypertonic solution they ____.
    Shrivel or crenate
  13. We used carmine particles in order to view ____ ____.
    Brownian Mvmt
  14. We use dialysis tubing to separate out particles according to ____.
    Weight
  15. RBC membranes are ____ permeable.
    Selectively
  16. In elodea, turgor pressure can change w/o damage to the plant cell due to the presence of what structure?
    Cell wall
  17. How does a catalyst influence the rate of a chemical reaction?
    Speeds it up
  18. Are biological catalysts changed during chemical reactions?
    No
  19. The ____ is the reactant molecule changed by a catalyst.
    Substrate
  20. Biological processes depend on molecular catalysts called ____.
    Enzymes
  21. What enzyme breaks down sucrose into glucose & fructose?
    Sucrase
  22. The force applied to prevent the osmotic mvmt of H₂O across a membrane fr a hypotonic to a hypertonic solution is called ____ ____.
    Osmotic Pressure
  23. Random mvmt of particles is called ____ mvmt.
    Brownian
  24. The physical process where molecules move fr an area where they are in high concentration to 1 of lower concentration is called ____.
    Diffusion
  25. Organelle membranes & the plasma membrane allow H₂O to pass freely through them, while regulating the mvmt of solutes. These membranes are ____ ____.
    Selectively Permeable
  26. The passage of H₂O molecules thru a selectively permeable membrane fr a region of high concentration to a region of low concentration is called ____.
    Osmosis
  27. Would the upper layer of clarified butter have a (+) or (-) biuret reaction?
    Negative
  28. If a food tastes sweet but yields a neg reaction to Benedict's Solution, what might this suggest?
    The food may be made up of polysaccharides & Benedict's Solution only detects mono- & disaccharides
  29. Clarified butter lacks the usual butter flavor. What does this suggest about the molecules responsible for the taste of butter?
    The moles responsible for the taste are located in the H₂O soluble protein & not in the lipids
  30. In an ____ the lipids occur in very small droplets dispersed throughout the H₂O soluble portion.
    Emulsion
  31. If a potato is hydrolyzed would it have a pos or neg reaction to iodine reagent?
    Negative
  32. Does sucrose give a pos reaction w/Benedict's solution?
    No
  33. I₂Kl (iodine reagent) turns a deep blue in the presence of ____.
    Starch
  34. Disaccharides are cleaved into monosaccharides by a process of ____.
    Hydrolysis
  35. What method did we utilize to test for the presence of lipids?
    Paper Test
  36. When Biuret reagent reacts w/proteins, it changes color from ____ to ____ or ____ ____.
    • Blue
    • Lavender or light violet
  37. The example of an emulsion we used was ____.
    Butter
  38. ____ is the process by which lipids can be separated from water-soluble, protein containing parts of butter.
    Clarification
  39. What are the building blocks of carbohydrates?
    Monosaccharides
  40. We metabolize food in order to release in the form of ____.
    ATP
  41. Sugar is sweet. Mindful of this, what would you predict the results of a test using Benedict's solution & an artificial sweetener such as saccharin or "Equal" to be?
    Negative
  42. The most important pigment in green plants is ____.
    Chlorophyll
  43. What gas is required for photosynthesis?
    CO₂
  44. What gas is produced by photosynthesis?
    O₂
  45. Photosynthesis absorbs energy in the form of light. What is the source of that light?
    Sun
  46. Pigments in leaves that absorb solar energy & then pass the energy on to other photosynthetic pigments are called____ ____.
    Accessory Pigments
  47. In a catecholase reaction, what reddish brown product was produced?
    Benzoquinone
  48. What light is divided into its component wavelengths using an instrument called a ____.
    Spectrophotometer
  49. As this reddish brown product increased during the reaction, did the amt of absorbance measured by the instrument decrease or increase?
    Increase
  50. Catecholase catalyzes a reaction using the substrate called ____.
    Catechol
  51. Many factors affect the reaction rate of a biochemical reaction. Name a couple.
    pH, Temp, Enzymes, salinity
  52. Convert 0.005328 to scientific notation.
    5.238 x 10⁻³
  53. Convert 488,471,566 to scientific notation.
    4.88 x 10⁸
  54. The dependent variable is always plotted on which axis of the graph?
    Y axis
  55. Convert 2.80mm to μm.
    2.8 x 10³μm
  56. Convert 460 ml to L.
    0.460 L
  57. The pH scale ranges from . . .
    0-14
  58. A solution whose pH resists change on addition of sm amts of either acid or base is called a ____ solution.
    Buffer
  59. Acidic substances are (above/below) 7?
    Below
  60. Extract of red cabbage is used as an indicator for ___.
    pH
  61. A solution w/a pH value of 4 would have a how many times greater concentration of H⁺ than a solution w/a pH of 5?
    10 times greater
  62. The best microscope to use in order to view an extremely thick section of a sample is a ____ microscope.
    Stereoscopic
  63. The part of the microscope that holds the slide is the ____.
    Stage
  64. The nose piece of a compound light microscope holds what lens?
    Objective
  65. The total magnification of a prepared specimen viewed under a compound light microscope w/an eye magnification x10 & an objective lens magnification x40 is ____.
    x400
  66. The ability to distinguish 2 objects that are very close together as separate is a characteristic referred to as what?
    Resolution
  67. The pH of your garden soil is 8.0; the pH of your plant fertilizer is 3.0. How much greater is the concentration of H⁺ in the fertilizer than the garden soil.
    100,000 times
  68. In the lab we used buffers to calibrate the pH meter b/f we measured the pH of the solution. If you want to adjust the pH of the solution to 7.3 what buffer should we use 1st in order to calibrate the meter in that range?
    Buffer pH of 7
  69. Describe the capacity of a buffer.
    With a small amt of either an acid or base added to a buffered solution, there is little or no change in pH
  70. When phenol red was added to an unk solution, the solution turned yellow indicating the pH was ____ than 7.
    Less than
  71. What was the buffer we used in the lab?
    NaHCO₃
  72. What was the name of the stain we used on the wet mount of cheek scrapings?
    Methalene Blue
  73. Using the stereoscopic (dissecting) microscope, the letter "e" viewed thru the eyepieces appeared to be right-side up or upside down?
    Right-side up
  74. When you used the colored slides @ obj lens x4 the image you saw was (field of view or depth of focus).
    Field of View
  75. The plant cells we used in the lab were ____.
    elodea
  76. Viewing the slide of 3 colored threads, as you increase the pwr of the magnification by changing the obj lens of the light microscope, did the depth of focus increase or decrease?
    Decreased
  77. Monomers of proteins are called ____ ___.
    Amino Acids
  78. What are the 3 classes of macromolecules we studied?
    • Carbohydrates
    • Lipids
    • Proteins
  79. What reagent did we use to test for starch?
    Iodine
  80. We used biuret reagent to test for the presence of ____.
    Proteins

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