Laboratory Notes for BIO 3001

© 4 July 2009, John H. Wahlert


How many yeast cells are in a packet?

yeast packet

Materials

  • 1 package of dry yeast (7.0 grams)
  • One 1000 ml beaker for stock solution
  • Two droppers

Student equipment (six sets total for 6 groups of 4):

  • Six 10 ml graduated cylindars, 1 at each station for sample of stock suspension
  • Six 2 ml pipettes, 1 at each station
  • Six 2.5 ml beakers at each station
  • microscopes
  • calculators
  • microscope slides
  • cover slips
  • Six droppers at each station

Themes

  • How do you estimate the number of something that is too small and numerous to count individually?
  • How might this be relevant to determining the severity of a bacterial or fungal infection?

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Last updated 28 February 2011 (JHW)