Microscopy and cell fractionation Quiz
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5 questions, one answer each
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1. An image of a cell is 24 mm long and the magnification is ×400. What is the actual length of the cell?
- A. 0.06 μm
- B. 6 μm
- C. 60 μm
- D. 600 μm
2. Which microscope gives a three-dimensional image of a specimen's surface?
- A. Scanning electron microscope
- B. Transmission electron microscope
- C. Optical microscope
- D. Eyepiece graticule
3. During cell fractionation, tissue is homogenised in cold isotonic buffer. The solution is isotonic to:
- A. Reduce enzyme activity
- B. Prevent osmotic damage to organelles
- C. Keep the pH constant
- D. Remove cell debris
4. In ultracentrifugation, which organelle will form a pellet first?
- A. Ribosomes
- B. Lysosomes
- C. Mitochondria
- D. Nuclei
5. Why does the TEM give a higher resolution than the optical microscope?
- A. It uses a beam with a shorter wavelength
- B. It uses more lenses
- C. It gives a higher magnification only
- D. It views living cells