Study of life and the Cell chapter 1

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Study of life and the Cell chapter 1

• Biology in Use
• Who uses Biology?
• 1. Beekeeper needs to know how bees work.
• 2. Crime lab technician must study evidence
  cloth fiber, bits of paper, skin, and blood.
  Needs to know how to use a microscope.

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Tools used in Biology

• 1. Hand lens Type of magnifying
  glass/objects are 3 to 5 times larger.
• 2. Microscope one of the important tools
  used by biologists.

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• a. __________________
• i. Total magnification to find total
  magnification when looking through
  eyepiece lens and objective lens.
  Eyepiece lens 10 x low power objective
  lens 10 total.

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• ii. low power objective magnifies 10 times 10
• iii. High power objective can magnify 40 to
  100 times.

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• b. Stereo microscope viewing large objects
  in which light cannot pass through. An example
  of this would be an insect.
• i. Advantage 2 eyepieces make the object 3
  dimensional.
• ii. Disadvantage magnify power not as
  great.

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• The computer To store, find, and process
  information.
• Other tools used by a biologist.
• a. cameras Study animals
• b. boats and nets study fish
• c. Gardens study plants.

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• II. Measurements used in biology (11-14)
• International system of units measuring system
  based on units of ten.
• Length distance from one point to another.
• 1. Meter SI units of length

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• 2. How metrics units are grouped.
• kilo________k______1000
• hecto_______h______ 100
• deka_______ da______ 10
• liter, meter, or gram
• dec________ d _____ 0.1
• centi_______ c _____ 0.01
• milli_______ m_____ 0.001

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• e. Time and temperature
• 1. Second SI unit of measuring time
  stopwatch or clock is used.
• 2. Kelvin SI unit measuring
  temperature.

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• 3. Celsius easier to use than kelvin.
• Temperature scales divides into Celsius,
  freezing point is -0-.
• III. The scientific method (15-20)

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• a. recognizing and researching the
  problem. Example
• Paula thought that if the light in the fish
  tank was off, more guppies would reproduce.

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• b. Forming a hypothesis is a statement that can
  be tested.
• c. Testing the hypothesis
• 1. Experiment two fish tanks, light is left
  on in one and the light left off in the other (A
  and B group)

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• 2. Variable- something causes changes observed
  in an experiment. Effects of one variable can
  be testes.
• 3. Control is a standard for testing results.

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• 4. Data- Paula kept a record of information she
  gathered. She recored facts of the measurements
  in the experiment.
• d. Drawing conclusions conclude whether problem
  was solved. To be sure of the conclusion repeat
  experiment fro conformation of hypothesis.

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• Theory best explanation science has to offer.
  It is a hypothesis that has been testes again and
  again by many scientists with similar results
  each time.
• Technology the use of scientific discoveries to
  solve every day problems