1. Chapter 1 The Study of Life

2. Biology is the study of things that are alive and things that used to be alive
“Bio” is Latin for life
“ology” is Latin for “the study of”
Biology

3. The act of doing science IS NOT limited to scientists
Biology isn’t limited to only field biologists
Beekeepers have to know how bees behave, how they work together, best placement of hives
Doctors study biology before medical school
Farmers, physical therapists and probably you all use some form of biology
Who uses biology?

4. Tools of biology Microscopes Scientific measurement
The Scientific Method
Tools of biology

5. The light microscope

6. Fill in the handout correctly

7. In a light microscope, light passes through a specimen then through two lenses
The lenses magnify the image of the specimen and it appears larger
The light microscope

8. The two main lenses are the objective and the eyepiece (or ocular lens)
The objective lens can be changed and each objective lens has a different magnification
The eyepiece has an additional magnification (usually 10X)
The total magnification = magnification of objective lens x magnification of eyepiece
The highest powered light microscopes can magnify up to 2000 times
magnification

9. What is the total magnification if you are using the 40x objective lens and the eyepiece has a magnification of 10x?
practice

10. Stereo microscope The stereo microscope has two eyepieces
It is used to view larger samples and specimen
It is sometimes called a dissecting scope
Stereo microscopes can magnify up to 60 times
Stereo microscope

11. Electron microscopes use a beam of electrons instead of light
The images can be very detailed and objects can be magnified up to 500,000 times
These images cannot be in color
The process is expensive and the specimen is killed during the process
Electron microscopes

13. Scientific measurement
SI units (standard internationale)
These are metric units of measurement they are the standard units used by scientists all over the world
Using standard units helps with consistency, and communication
Scientific measurement

14. Scientific measurement
This system is based on units of 10
Very similar to money
How many pennies equal one dime?
How many dimes equal one dollar?
In a similar way, 10 millimeters equal one centimeter
10 centimeters equal one decimeter
And 10 decimeters equal one meter
Scientific measurement

16. Scientific method What is the scientific method?
It is a series of steps used to solve problems
Have you ever used the scientific method?
Have you ever used it while NOT in science class?
Yes, you have
Scientific method

18. Question/problem: the problem you’re trying to solve
Hypothesis: your guess as to the solution to the problem or answer to question
Experiment: the procedure used to test the hypothesis
Variables: things that can be changed in experiment (ex. Time, temperature, volume of a substance)
Control: a standard used for comparison
Data: recorded facts, observations and measurements from the experiemnt
Parts of an experiment

19. When the experiment is complete one must analyze the data that was collected
Conclusion: Comparing the data/results of experiment to the problem and hypothesis.
This is done to determine whether or not the hypothesis was correct or not
Drawing conclusions

20. A theory is a hypothesis that has been tested numerous times with similar results each time.
Theories are not guesses. They are the best explanations science has to offer about a problem.
theory

21. technology What is technology?
The use of scientific discoveries to solve everyday problems is called technology
Sometimes called applied science
technology