Why will transparent cells be easier to view with less light

Reference no: EM133650729

Questions

1. You are told that viewing is best done with as little illumination as possible. Why will transparent cells be easier to view with less light? (Hint: is it resolution, magnification or contrast?)

2. Why should Brownian motion increase the longer you observe a hanging drop or wet mount preparation? (Hint: The slides are sitting on top of a light bulb)

3. If you examined pond water, did you notice any bacteria swimming in "runs and tumbles"? Did you notice any swimming in more-or-less straight lines? If yes, describe the cell morphology (bacilli, cocci, or other).

4. Motility because of flagella is the most common form of bacterial locomotion, but some bacteria glide. If you examined pond water, did you notice any gliding cyanobacteria? If yes, describe the morphology.

5. In a wet mount, how would a receding water line (from the specimen drying out) affect your interpretation of whether organisms you see are motile or not?

Reference no: EM133650729

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