1. Yeast Lab Introduction

2. 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

3. 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

4. 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)

5. 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?

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

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

8. 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

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

10. Hemocytometer slide