Cells and Heredity Science Test

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veiwsonic2
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212481
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Cells and Heredity Science Test
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2013-04-09 19:02:20
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Seventh Grade Cells Heredity Science Test
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Made 4/9/13, Test 4/12/13
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  1. What is a microscope?
    An instrument used to make small objects appear larger
  2. What did the invention of the microscope allow people to discover?
    Cells
  3. What is resolution and why is it important?
    The sharpness of an image - allows you to see an organism clearly
  4. What are the types of microscopes used today?
    Scientists today use light, electron, and x-ray microscopes
  5. What is a light microscope?
    Makes objects appear bigger by focusing light using glass and sometimes plastic lenses
  6. How are electron and x-ray microscopes different from light microscopes?
    Electron microscopes use beams of electrons to produce a magnified image while x-ray microscopes use x-rays to produce a magnified image.
  7. Why are electron and x-ray microscopes better than light microscopes?
    The resolution of x-ray microscopes is much better than the resolution of light microscopes allowing higher magnification.
  8. What type of lenses are in a light microscope?
    The lenses in a microscope are called convex lenses because they are curved lenses that are thicker in the middle.
  9. How do the lenses change the light to magnify the object?
    A lens in light microscopes magnifies the object by bending the light that passes through the lens
  10. What is the difference between a simple light microscope and a compound light microscope?
    A simple microscope is a light microscope that contains only one lens, while a compound microscope is a light microscope that contains more than one lens
  11. What are the names of the lenses in a compound light microscope?
    The lens closest to your eye is called the ocular or eyepiece, while the other lens, which is closest to the object that you wish to study is called the objective lens
  12. How do you determine the total magnification for a compound light microscope?
    total magnification = ocular magnification x objective magnification
  13. What type of microscopes do we have at school?
    Our microscopes are compound light microscopes
  14. How many lenses do we use when we use out microscope?
    We only use one objective lens to view a specimen, so we use two lenses total to view a specimen, the eyepiece and one objective lens
  15. What is the magnification for the eyepiece on our microscopes?
    The magnification for the ocular lens on out microscope is 10x
  16. What is the magnification of the objective lenses on our microscopes?
    Our microsopes have three objective lenses and their magnifications are: low power is 4x, medium power is 10x, and high power is 40x
  17. What is the total magnification of the objective lenses on our microscopes?
    The total magnification for each objective lens in our microscope is: low power - 40x, medium power - 100x, and high power - 400x
  18. How do you carry a microscope?
    You carry a microscope with one hand on the base and the other on the arm
  19. How do you begin observing a specimen?
    You always observe a specimen with the low power objective lens first
  20. How do you focus the microscope in how power?
    You focus the microscope with the low power objective lens in place using the coarse adjustment knob to get a rough focus and then the fine adjustment knob to sharpen the focus
  21. How do you focus the microscope in medium and high power?
    You focus the microscope with the medium or high power objective lens using only the fine adjustment knob to sharpen the focus so you do not scratch the objective lenses by hitting the specimen
  22. What is the function of the eyepiece?
    The eyepiece is part of the microscope, you look into it and it magnifies the specimen
  23. What is the function of the body tube?
    The body tube separates the eyepiece from the objective lens
  24. What is the function of the nose piece?
    The nose piece holds the objective lenses and allows you to choose which one to use
  25. What is the function of the high power objective lens?
    The high power objective lens magnifies the specimen the most
  26. What is the function of the low power objective lens?
    The low power objective lens magnifies the specimen the least
  27. What is the function of the diaphragm?
    The diaphragm controls the amount of light passing through the stage
  28. What is the function of the light source?
    the light source provides the light needed, outs is an electric light but it can also be a mirror
  29. What is the function of the base?
    The base supports the microscope and is used when carrying the microscope
  30. What is the function of the stage?
    The stage supports the slide that is being used
  31. What is the function of the stage clips?
    The stage clips hold the slide in place
  32. What is the function of the arm?
    The arm supports the body tube and is used when carrying the microscope
  33. What is the function of the fine adjustment knob?
    The fine adjustment knob is used to focus the microscope with all of the objective lenses
  34. What is the function of the coarse objective lens?
    The coarse adjustment knob is used to focus the microscope with the low power objective lens only
  35. What is the purpose of a microscope?
    To make a small object appear larger
  36. What is resolution?
    The ability to see individual parts of something clearly and sharply
  37. How does a light microscope work?
    When the light is focused using a lens, the objects will look better. (AKA it bends light)
  38. What type of lenses does a light microscope use?
    Glass or plastic convex lenses
  39. What is the difference between a simple and a compound light microscope?
    A simple microscope contains one lens whereas the compound microscope contains multiple lenses
  40. What is the equation for total magnification?
    Total magnification = ocular magnification x objective magnification
  41. What microscope uses electron beams to produce a magnifies image?
    An electron microscope
  42. How do you carry a microscope?
    With one hand on the arm and the other on the base
  43. A microscope should always be stored with what objective lens in place?
    The low objective lens
  44. Always bring a specimen into focus using what objective lens?
    The low objective lens
  45. Never use what adjustment knob to focus with the high-power or medium power objective lens in place?
    Coarse
  46. Do not allow direct sunlight to fall on what?
    The mirror
  47. Use what adjustment knob when focusing with the high - power objective lens in place?
    Fine
  48. Lenses should only be cleaned with what?
    Lens paper
  49. What is the power of the ocular on our microscope?
    10x
  50. What is the power for each of the three objective lenses on our microscopes?
    Low - 4x, medium - 10x, high - 40x
  51. What is the total magnification for each of the three objective lenses on our microscopes?
    low - 40x, medium - 100x, high - 400x
  52. If I gave you the total magnification and the lens magnification, what mathematical operation would you use to determine the eyepiece magnification?
    Total magnification

    Objective mag.
  53. The total magnification is 360x and the lens magnifications is 60x, what is the ocular magnification?
    60x
  54. What is the objective lens magnification if the total magnification is 200x and the eyepiece magnification is 10x?
    20x
  55. To properly use a(n) ______, it is necessary to know its part and functions.
    microscope
  56. What contains the magnifying lens to look through?
    The eyepiece
  57. What maintains the correct distance between the eyepiece and the objective lens?
    The body tube
  58. What holds high- and low- power objective lenses and can be rotated to change what?
    Nose piece, magnification
  59. What objective lens provides the most magnification?
    The high - power objective lens
  60. What objective lens provides the least magnification?
    The low objective lens
  61. The what adjustment knob moves the body tube up and down for focusing?
    The coarse adjustment knob
  62. What adjustment knob is used to sharpen the image of what s being viewed?
    The fine adjustment knob
  63. What regulates the amount of light that enters the body tube?
    The diaphragm
  64. What sends light upward through the diaphragm, the object, and the lenses?
    The light or mirror
  65. Always carry a microscope with how many hands?
    Both hands
  66. Never use direct what as a source of light? (microscopes)
    sunlight
  67. Look through the eyepiece and adjust the what to see the field of view?
    diaphragm
  68. What is placed on the stage and secured with stage clips?
    the slide
  69. Focus first on a slide with what power objective lens?
    Low
  70. Do not do what to the lenses?
    Touch them with your fingers
  71. Use the fine adjustment knob on what power?
    On the medium and high objective lenses
  72. When finished with the microscope, return what objective lens over the stage?
    The low-power objective lens
  73. When finished with the microscope, how far should the objective lenses me raised from the stage?
    Two or three centimeters
  74. If a microscope has two lenses and one has a magnification of 15x and the other has a magnification of 30x, what is the total magnification?
    450x
  75. How does a microscope lens work and what type of lenses are in our microscopes?
    The convex glass lenses on our microscopes make objects appear larger by focusing light.
  76. What does resolution mean?
    The sharpness of an image
  77. What did the invention of the microscope allow people to learn about and discover?
    Cells
  78. What type of light microscope uses two or more lenses?
    a compound microscope
  79. What type of lens is thicker in the center?
    A convex lens
  80. How do you focus the microscope while using the low power objective lens?
    Course then fine adjustment knob
  81. How do you focus the microscope while using the medium or high powered objective lens?
    fine adjustment knob
  82. How does an electron microscope produce a magnified image?
    It uses beams of electrons to produce an image
  83. Who was one of the first scientists to look at cells in 1663?
    One of the first people to look at cells was Robert Hooke. He looked at a thin slice of cork using his homemade compound light microscope. He called the empty spaces he saw cells, which means little rooms
  84. What type of microscope did Anton van Leeuwenhoek use and what specimens did he look at?
    He used a simple microscope that he built in his spare time to look at lake water, scrapings from teeth and gums, and water in rain gutters. He was surprised to find a variety of one-celled organisms. The ones that moved he called animalcules meaning little animals. We now call these animalcules bacteria
  85. What were the names of the three German scientists who made important contributions to Cell Theory?
    Mattias Schleiden, Theodor Schwann, and Rudolf Virchow
  86. What was Schleiden's contribution to Cell Theory?
    Schleiden concluded that all plants are made of cells.
  87. What was Schwann's contribution to Cell Theory?
    Schwann concluded that all animals are also made of cells so therefor all living organisms are made of cells
  88. What was Virchow's contribution to Cell Theory?
    Virchow proposed that all cells come from cells that already exist
  89. What is Cell Theory?
    Cell Theory is the widely accepted explanation of the relationship between cells and living things
  90. What are the three statements of Cell Theory?
    All living things are composed of cells, cells are the basic unit of structure and function in living things, and all cells are produced from other cells
  91. What does Cell Theory apply to?
    Cell Theory is true for all living things regardless of how big or small they are
  92. What type of cells were observed first?
    Cork cells
  93. Who was the first scientist to observe bacteria?
    Anton van Leeuwenhoek
  94. Compare and contrast magnification and resolution.
    Magnification is how many times larger an image appears whereas resolution is the sharpness of an image
  95. State how an electron microscope differs from a light microscope
    An electron microscope uses electrons to produce an image whereas a light microscope uses light to produce an image
  96. Explain how cells are related to living things
    All living things are made of cells
  97. What is a widely accepted explanation of the relationship between cells and living things?
    Cell theory
  98. What is the the basic unit of structure and function in living things?
    Cells
  99. What is an object what makes small objects appear larger?
    A microscope
  100. What makes up all organisms?
    Cells!

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