Micro test 1 study guide.docx - Chapter 3 1 Which of the...

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Chapter 3 1. Which of the following statements comparing electron microscopy and light microscopy is FALSE? The electron microscope has greater resolution than the light microscope. Electron microscopes can allow examination of viruses and internal cell structures, whereas light microscopes are limited to objects that are 0.5 micrometers and larger. Both the electron microscope and the light microscope use the same wavelengths for illumination. Images produced by light microscopes can be in color, whereas electron microscope images are black and white unless they are artificially colored.
2. Which of the following types of microscopy provides advantages for viewing live images?
3. What is the role of lenses in microscopy?
4. What is the role of iodine in the Gram stain process?
5. A student creates a Gram stain on a bacterial sample that has a mix of gram-negative and gram- positive organisms. The student accidentally forgets the decolorizer step. What would the outcome of the Gram stain be? All organisms would appear purple (gram-positive). The Gram stain would show pink (gram-negative bacteria) and purple (gram-positive bacteria). All organisms would appear pink (gram-negative). All organisms would appear colorless.
6. Consider the following situations, and determine when a simple stain could be used instead of a Gram stain. A microbiologist is trying to determine whether a specimen contains bacteria or fungi. (Correct.
7. Which of the following staining procedures is matched with the principal use for that stain?
acid-fast stain for microbes with waxy cell walls Correct. This stain is very useful in identifying Mycobacterium spp. that exhibit waxy cell walls.

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