Cells: Discovery And Exploration

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Cells: Discovery And Exploration - Quiz

This is a quick quiz to assess whether students have read and understood Chapter One, Cells: Discovery and exploration, of Nature of Biology Bk 1 (3rd edition).


Questions and Answers
  • 1. 

    Which English scientist described, from his observations of thin slices of cork, the box like structures he observed as 'cells'?

    • A.

      Robert Hooke

    • B.

      Robert Brown

    • C.

      Matthias Schleiden

    • D.

      Theodor Schwann

    Correct Answer
    A. Robert Hooke
    Explanation
    Robert Hooke is the correct answer because he was the English scientist who first described the box-like structures he observed in thin slices of cork as "cells". This observation, made in the 17th century, laid the foundation for the cell theory and our understanding of cells as the basic building blocks of life.

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  • 2. 

    What did Robert Brown, a Scottish botanist, called the cellular structure that he observed in each cell?

    • A.

      Vacuole

    • B.

      Nucleus

    • C.

      Mitochondria

    • D.

      Chloroplast

    Correct Answer
    B. Nucleus
    Explanation
    Robert Brown, a Scottish botanist, called the cellular structure that he observed in each cell the nucleus.

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  • 3. 

    Rudolf Virchow extended the Cell Theory proposed by Schwann and Schleiden by stating 'New cells are produced from existing cells.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Rudolf Virchow extended the Cell Theory by stating that new cells are produced from existing cells. This means that cells do not arise spontaneously but instead come from pre-existing cells. This concept is a fundamental principle in biology and is supported by extensive scientific evidence. Therefore, the statement is true.

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  • 4. 

    The figure below is of a paramecium. The specimen being viewed was not stained. What type of light microscope would be needed to view this specimen? Figure 1

    • A.

      Simple

    • B.

      Compound

    • C.

      Phase contrast

    • D.

      Scanning confocal

    Correct Answer
    C. Phase contrast
    Explanation
    Phase contrast microscopy is a type of light microscopy that allows the visualization of transparent, unstained specimens. It enhances the contrast between the specimen and its surroundings by manipulating the phase of light passing through different parts of the specimen. This technique is particularly useful for observing living cells, such as the paramecium shown in the figure, as it allows for detailed examination of their internal structures and movements without the need for staining.

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  • 5. 

    What type of microscopy would be used to observe the following image?

    • A.

      Differential interference contrast microscopes

    • B.

      Phase contrast microscope

    • C.

      Scanning electron microscope

    • D.

      Scanning confocal microscope

    Correct Answer
    A. Differential interference contrast microscopes
    Explanation
    Differential interference contrast microscopes would be used to observe the given image. These microscopes use polarized light to create contrast in the specimen, making it easier to observe details and structures that may not be visible with other types of microscopy. This technique enhances the differences in refractive index and thickness of different parts of the specimen, resulting in a clearer and more detailed image.

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  • 6. 

    A Transmission Electron Microscope was used to capture this image.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The given statement is false. A Transmission Electron Microscope (TEM) was not used to capture the image.

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  • 7. 

    0.1 micro metre = ________   nanometres

    Correct Answer
    100
    Explanation
    To convert from micrometers to nanometers, we multiply by 1000 because there are 1000 nanometers in 1 micrometer. Therefore, 0.1 micrometer is equal to 100 nanometers.

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  • 8. 

    What happens to your field of view when you increase the magnification?

    • A.

      Stays the same

    • B.

      Gets larger

    • C.

      Gets smaller

    Correct Answer
    C. Gets smaller
    Explanation
    When you increase the magnification, your field of view gets smaller. This means that you are able to see less of the overall scene or object you are looking at. Increasing the magnification zooms in on a smaller portion of the image, allowing you to see more details but sacrificing the ability to see the entire picture.

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  • 9. 

    If the objective lens of a light microscope has a 5         magnification and its ocular lens is 10       , then the magnification obtained of a object being viewed would be 15       .

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The question states that the objective lens has a magnification of 5 and the ocular lens has a magnification of 10. To calculate the total magnification, we multiply the magnification of the objective lens by the magnification of the ocular lens. In this case, 5 multiplied by 10 equals 50, not 15. Therefore, the statement that the magnification obtained would be 15 is false.

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  • 10. 

    The resolving power of a TEM is greater than that of a LM.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The resolving power of a microscope refers to its ability to distinguish two closely spaced objects as separate entities. In this case, the statement suggests that the resolving power of a Transmission Electron Microscope (TEM) is greater than that of a Light Microscope (LM). This is because the wavelength of electrons used in a TEM is much shorter than the wavelength of visible light used in an LM, allowing for higher resolution and the ability to observe smaller details in the sample. Therefore, the statement is true.

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