Yeast Lab!

Consider the following questions…
 How big/complex must something be?
 What must it be able to do?
 Where must it come from?
 What are the essential components?
 How is it different from something nonliving?
 Is seeing believing??????
 http://www.youtube.com/watch?v=juxLuo-sH6M
Is Yeast living?

 1. Living things are based on a universal genetic code.
 All organisms store the complex information they need to live, grow, and reproduce in a genetic code written in a molecule called
!
 The information is copied and passed on from parent to offspring.
 With a few minor variations, life’s genetic code is almost
in every organism on Earth.


 Every organism has a particular pattern of growth and development.
 During development, a single fertilized egg divides and divides again.
 As these cells divide, they differentiate , which means they begin to look different from one another and perform different functions.

 3. Living things respond to their environment.
 Organisms detect and respond to stimuli from their environment.
 A
is a signal to which an organism responds.

 4. Living things reproduce.
 All organisms reproduce, which means that they produce new similar organisms. Most plants and animals engage in sexual reproduction.
 In sexual reproduction , cells from two parents unite to form the first cell of a new organism.
 Other organisms reproduce through asexual reproduction , in which a single organism produces offspring identical to itself.

 5. Living things maintain a stable internal environment.
 Most organisms need to keep conditions inside their bodies as constant as possible, even when external conditions change dramatically.
 All living organisms expend energy to keep conditions inside their cells within certain limits. This process is called

 6. Living things obtain and use materials and energy.
 All organisms must take in materials and energy to grow, develop, and reproduce.
 The combination of chemical reactions through which an organism builds up or breaks down materials is called
metabolism.


 Over generations, groups of organisms evolve , or change over time.
 Evolutionary change links all forms of life to a common origin more than 3.5 billion years ago.
 Evidence of this shared history is found in all aspects of living and fossil organisms, from physical features to structures of proteins to sequences of information in
DNA.

 8. Living things are made up of cells.
 Organisms are composed of one or more cells- the smallest units considered fully alive.
 Cells can grow, respond to their surroundings, and reproduce.
 Despite their small size, cells are complex and highly organized.


http://www.youtube.com/watch?v=uM_CgOgJGG0
 1. Living things are based on a universal genetic code.
 2. Living things grow and develop.
 3. Living things respond to their environment.
 4. Living things reproduce.
 5. Living things maintain a stable internal environment (homeostasis).
 6. Living things obtain and use materials and energy
(metabolism).
 7. Taken as a group, living things evolve.
 8. Living things are made up of cells.

 Make Observations and Ask Questions
 Form a Hypothesis
 Design an Investigation
 Test the Predictions
 Analyze the Results
 Conclusion

 Describe what you can see, taste, smell, feel, etc!
 What is yeast? What would it need to be considered living?
 What will we be looking at in this experiment

 Hypothesis:
 is a possible explanation for an observation or a scientific problem that is given to you.
 Must include only one independent variable
 Example: If you increase the light intensity, then the plant growth rate will increase.

 Identify the variables:


Independent variable
 Set by the person carrying out the investigation (ex. time , temperature, light intensity, pH)
Dependent variable
 Measured during the investigation (ex. plant growth, heart rate etc)
 Controlled variable
 Factors that are kept the same or controlled. (ex. Amount of water, fertilizer, temperature)

 An experiment typically contains a:
 Control group
 Exposed to the same conditions as the experimental group except for one independent variable.
 Serves as a standard for comparison to the…
 Experimental group
 The group that the independent variable is applied to.

 Use step by step procedure to perform your experiment

 Discuss trends in the data you collected in your experiment
 You may have to perform calculations depending on the data you collect

 Does your data all0w you to support or reject your hypothesis?
 What did you learn from this experiment, and how does this connect to the knowledge you had going into the experiment?
 How would you do the experiment if you were to perform it again?

 Make Observations and Ask Questions
 Form a Hypothesis
 Make Predictions
 Design an Investigation
 Test the Predictions
 Analyze the Results
 Conclusion