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.
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.
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.
ii. low power objective magnifies 10 times 10
iii. High power objective can magnify 40 to 100 times.
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.
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.
II. Measurements used in biology (1114)
International system of units – measuring system based on units of ten. Length – distance from one point to another. 1. Meter – SI units of length
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
e. Time and temperature
1. Second – SI unit of measuring time –stopwatch or clock is used.
2. Kelvin – SI unit measuring temperature.
3. Celsius – easier to use than kelvin.
Temperature scales divides into Celsius, freezing point is -0-.
III. The scientific method (15-20)
a. recognizing and researching the problem. Example:
Paula thought that if the light in the fish tank was off, more guppies would reproduce.
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)
2. Variable- something causes changes observed in an experiment. Effects of one variable can be testes. 3. Control – is a standard for testing results.
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.
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