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CHAPTER 1- THE STUDY OF LIFE

I.     Biology: Study of living and once-living things

Biologist: A person who studies living things.

People use biology in their everyday lives. Technology is used in science to solve everyday problems. Technology, including computers, is used to make artificial hearts, and to find genetic sequences.

Careers in Science

II.     Scientific Method –Scientists (and everyday people!) use a series of several
       steps to solve a problem.

Steps of the Scientific Method:

 

Scientific Method Concept Map

III.     Tools of Biology

Microscopes are primarily used in biology to magnify things.

                  A.    Light MicroscopeUses light to magnify small objects

  • Eyepiece lens: 10X magnification
  • Objective lens: Low Power = 10X magnification
                              High Power Lens = 40X or 100X
                                                                 magnification

    Eyepiece lens X Objective Lens = Total Lens Magnification

     

                B.    Stereomicroscope – For viewing large objects that light cannot pass
                      through (ex: insects)

                C.    Electron Microscope – Uses beams of electrons to magnify objects,
                       which are viewed on a monitor.

  • Advantage: Can magnify up to 500,000X
  • Disadvantages: Cannot view objects in color, dyes are expensive, need skill & training

IV.   Measurements in Biology

International System of Units – (SI Units, or the Metric System): Measuring system based on units of 10, used universally for scientific measurements.

m

c

d

Liter (Volume)

da

h

k

Milli

Centi

Deci

Meter (Length)

Deka

Hecta

Kilo

1/1,000

1/100

1/10

Gram (Weight/ mass)

10

100

1,000

     

5,000 g

     
         

40 hl

 
   

0.8 dm

       

F = 1.8 (C) + 32

 

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