Yeast Lab Introduction

What are Yeast? Eukaryotic microorganisms Types of fungi Unicellular organisms Molds Used in winemaking, baking, and brewing Fermentation is the process in which the yeast converts carbohydrates to carbon dioxide and alcohols

So what? Why are we talking about yeast? Yeasts are model organisms Size Generation time Accessibility Ease of care and manipulation We are going to use them next week in an experiment to study populations You will work with your group to sample a population of yeast over 8 days

TODAY Learn how to calculate population sizes from a sample collected Recall the sampling lab from last week Your practice calculations sheet will be due on BLOCK Practice these calculations (Check for Understanding this FRIDAY)

Scientific Notation… …A quick way to write really, really BIG (or really, really, small) numbers Using powers of 10, you can create short versions of long numbers Proper Scientific Notation A number must be between 1 and 10 Must be multiplied by a power of ten Ex: 45 X 108 is NOT proper scientific notation. Why not?

Examples of Scientific Notation 76,000,000 can be rewritten as… 7.6 X 107 0.000000089 can be rewritten as… 8.9 X 10-8

Your turn Use Scientific Notation to rewrite the following numbers: 347,000 902,000,000 0.0000614 Answers: 3.47 X 105 9.02 X 108 6.14 X 10-5

Switch these back to their long forms 6.08 X 106 1.23 X 105 8.25 X 10-2 Answers 6,080,000 123,000 0.0825

Hemocytometer slide WE WILL BE USING THIS SLIDE IN THE LAB TO SAMPLE OUR YEAST POPULATIONS

Hemocytometer slide