Lesson 2.1.1a
2.1.1a Microscopy and observing cells Quiz: OCR Biology, Unit 1
20 questions
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Lesson 2.1.1a, Microscopy and observing cells: 20 multiple choice questions for the OCR Biology (H020), Unit 1: Foundations in biology, written with Revision Ninja.
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The 20 questions
-
Which type of microscope gives high-resolution images of the internal ultrastructure of cells?
- Scanning electron microscope
- Dissecting microscope
- Transmission electron microscope
- Light microscope
-
Which microscope produces a three-dimensional image of the surface of a specimen?
- Light microscope
- Transmission electron microscope
- Scanning electron microscope
- Phase contrast microscope
-
Which advantage is unique to light microscopy compared to electron microscopy?
- Greater magnification
- Higher resolution
- Thicker sections
- Living specimens
-
What is the primary function of an eyepiece graticule?
- Providing illumination
- Staining specimens
- Magnifying images
- Measuring object size
-
What device is used to calibrate an eyepiece graticule?
- Phase contrast lens
- Electron beam
- Cover slip
- Stage micrometer
-
What is the main purpose of differential staining in light microscopy?
- Killing microorganisms
- Creating a vacuum
- Increasing magnification
- Distinguishing cell components
-
What formula calculates microscope magnification?
- Actual minus image
- Image multiplied by actual
- Actual divided by image
- Image divided by actual
-
A nucleus appears 36 mm wide in a micrograph taken at x1200. What is its actual width?
- 43.2 micrometres
- 3 micrometres
- 30 micrometres
- 300 micrometres
-
A bacterium is 2 micrometres long and appears 40 mm long in a micrograph. What is the magnification?
- x20,000
- x2,000
- x80
- x200,000
-
A stage micrometer division is 10 micrometres. Ten eyepiece graticule divisions line up with 4 stage micrometer divisions. What is the length of one graticule division?
- 40 micrometres
- 0.4 micrometres
- 4 micrometres
- 2.5 micrometres
-
Convert 0.5 mm to micrometres and then to nanometres.
- 500 micrometres and 5,000 nm
- 500 micrometres and 500,000 nm
- 5 micrometres and 5,000 nm
- 50 micrometres and 50,000 nm
-
A chloroplast is 5 micrometres across and appears 75 mm across in a micrograph. What is the magnification?
- x375
- x150,000
- x1,500
- x15,000
-
A eukaryotic cell appears 8 cm across in a micrograph at x800. What is its real diameter?
- 1 mm
- 6400 micrometres
- 100 micrometres
- 10 micrometres
-
What happens when you enlarge an image beyond the resolution limit?
- Magnification decreases
- Wavelength shortens
- Image becomes blurrier
- Detail increases
-
The eyepiece graticule division is calibrated as 2 micrometres at x400. What does one division represent at x1000?
- 5 micrometres
- 0.8 micrometres
- 0.4 micrometres
- 2 micrometres
-
Why do electron microscopes require a vacuum?
- Generate heat
- Prevent electron scattering
- Increase light intensity
- Stain specimens
-
A student views an organelle 1 micrometre across at x400. What width does it appear in the image?
- 40 micrometres
- 400 micrometres (0.4 mm)
- 4 mm
- 0.4 micrometres
-
Which microscope type is best for viewing external surface details?
- Transmission electron microscope
- Light microscope
- Scanning electron microscope
- Laser scanning microscope
-
A cell in a micrograph measures 60 mm across at x3000, and a mitochondrion in the same image measures 9 mm across. What is the real width of the mitochondrion?
- 0.3 micrometres
- 30 micrometres
- 27 micrometres
- 3 micrometres
-
A graticule division is 3 micrometres at x600. A cell spans 25 graticule divisions at x1200. What is its real length?
- 18.75 micrometres
- 75 micrometres
- 37.5 micrometres
- 3 micrometres
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