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Questions and Answers
Who coined the term 'cell' to describe the repetitive units observed in cork?
Who coined the term 'cell' to describe the repetitive units observed in cork?
- The mid-17th century scientists
- A monk at a monastery
- Anton van Leeuwenhoek
- Robert Hooke (correct)
What was the material used to make the tube of Robert Hooke's compound microscope?
What was the material used to make the tube of Robert Hooke's compound microscope?
- Leather (correct)
- Brass
- Wood
- Plastic
What was the design of Anton van Leeuwenhoek's microscope?
What was the design of Anton van Leeuwenhoek's microscope?
- Compound microscope with leather tube
- Triple concave glass lenses
- Single, high quality glass lens held in place by a brass plate (correct)
- Double convex glass lenses
In what century did Robert Hooke position a piece of thinly sliced cork on his compound microscope?
In what century did Robert Hooke position a piece of thinly sliced cork on his compound microscope?
Which organelle is responsible for cytoplasmic streaming in the Elodea leaf cells?
Which organelle is responsible for cytoplasmic streaming in the Elodea leaf cells?
What is the approximate size of the chloroplasts in the Elodea leaf cells?
What is the approximate size of the chloroplasts in the Elodea leaf cells?
What is the function of a waxy cuticle on the upper surface of the privet leaf?
What is the function of a waxy cuticle on the upper surface of the privet leaf?
Why do you not observe the small round violet structure in all of the cells of the privet leaf?
Why do you not observe the small round violet structure in all of the cells of the privet leaf?
What is the approximate size of a single spot on the human cheek cells slide?
What is the approximate size of a single spot on the human cheek cells slide?
What is the function of the chloroplasts in the Elodea leaf cells?
What is the function of the chloroplasts in the Elodea leaf cells?
What is the main difference between the Elodea leaf cells and the human cheek cells?
What is the main difference between the Elodea leaf cells and the human cheek cells?
What is the function of the nuclei in the human cheek cells?
What is the function of the nuclei in the human cheek cells?
What is the approximate size of a human cheek cell?
What is the approximate size of a human cheek cell?
What is the function of the cell walls in the Elodea leaf cells?
What is the function of the cell walls in the Elodea leaf cells?
What is the function of the cytoplasm in the human cheek cells?
What is the function of the cytoplasm in the human cheek cells?
What is the main function of the organelle/structure stained pink on the privet leaf slide?
What is the main function of the organelle/structure stained pink on the privet leaf slide?
Which part of the compound microscope is responsible for controlling the amount of light reaching the specimen?
Which part of the compound microscope is responsible for controlling the amount of light reaching the specimen?
What is the main contribution of Theodore Schwann and Matthias Schleiden to the development of modern cell theory?
What is the main contribution of Theodore Schwann and Matthias Schleiden to the development of modern cell theory?
What is the function of the oil used for higher magnification in a compound microscope?
What is the function of the oil used for higher magnification in a compound microscope?
What should be done before focusing on the specimen when using a compound microscope?
What should be done before focusing on the specimen when using a compound microscope?
What is the smallest living unit according to the cell theory?
What is the smallest living unit according to the cell theory?
What is the purpose of using the provided plastic dust cover for a microscope?
What is the purpose of using the provided plastic dust cover for a microscope?
What happens to the field of view when increasing the magnification on a compound microscope?
What happens to the field of view when increasing the magnification on a compound microscope?
What is the main function of the objective lens in a compound microscope?
What is the main function of the objective lens in a compound microscope?
What is the purpose of adjusting the light intensity dial on a compound microscope?
What is the purpose of adjusting the light intensity dial on a compound microscope?
What is the consequence of not using both hands to carry a microscope?
What is the consequence of not using both hands to carry a microscope?
What is the recommended method for cleaning optical components of a microscope?
What is the recommended method for cleaning optical components of a microscope?
Why is proficiency in using a microscope crucial for scientists across disciplines?
Why is proficiency in using a microscope crucial for scientists across disciplines?
What is the formula for calculating total magnification in a compound microscope?
What is the formula for calculating total magnification in a compound microscope?
What is the size of ocular divisions at 100X magnification?
What is the size of ocular divisions at 100X magnification?
What does the total magnification affect in a compound microscope?
What does the total magnification affect in a compound microscope?
What is the purpose of observing cloth fibers (nylon, cotton, wool) under the microscope?
What is the purpose of observing cloth fibers (nylon, cotton, wool) under the microscope?
What is the formula for calculating the actual size of a specimen in micrometers?
What is the formula for calculating the actual size of a specimen in micrometers?
What happens to the number of ocular divisions when using the 10x objective lens?
What happens to the number of ocular divisions when using the 10x objective lens?
What is the range of ocular division size at different magnifications?
What is the range of ocular division size at different magnifications?
What is the objective lens magnification if the total magnification is 400X and the ocular lens magnification is 10X?
What is the objective lens magnification if the total magnification is 400X and the ocular lens magnification is 10X?
What characteristic of cloth fibers is aimed to be determined through microscope observations?
What characteristic of cloth fibers is aimed to be determined through microscope observations?
What is the purpose of the ocular ruler with 10 units and 100 divisions?
What is the purpose of the ocular ruler with 10 units and 100 divisions?
What is the relationship between the calculated letter size and the number of ocular divisions when using the 10x objective?
What is the relationship between the calculated letter size and the number of ocular divisions when using the 10x objective?
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Study Notes
Using a Compound Microscope: Observations and Measurements
- The Leica™ DM750 microscopes have an ocular ruler with 10 units and 100 divisions.
- To determine the actual size of a specimen in micrometers, note the objective lens magnification and division size at that magnification.
- Total magnification is calculated by multiplying the magnification of the objective lenses by the magnification of the ocular lens (10x).
- The size of ocular divisions at different magnifications range from 25 µm at 4X magnification to 1 µm at 100X magnification.
- Total magnification affects the apparent size of an object under the microscope, but not its actual size.
- In an experiment, the width of printed letters was measured at different font sizes using the ocular micrometer.
- When using the 10x objective, the number of ocular divisions increases, but the calculated letter size remains unchanged.
- Cloth fibers (nylon, cotton, wool) were observed under the microscope to identify their texture, arrangement, and characteristics.
- Observations of the cloth fibers aimed to determine their 3-D arrangement and characteristics such as smoothness, roughness, flatness, scales, projections, and twisting.
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