Transcript Biology - Images

Biology
 Biology is the Study of LIFE
 Biology includes the study of life at all levels:
biochemical, cellular, organs, organism, populations
and ecosystems
 All Science uses the scientific method to help
understand the living and non living world
 Sciences can not be totally studied in isolation (when
studying Biology, we will look at: chemistry, geology,
astrophysics, and others)
Chemistry of Biology
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Four groups of organic molecules in living things
(organisms)
1. Carbohydrates: quick energy (sugars, starches)
2. Proteins: long chains of amino acids (20)
3. Lipids: ( fats, cholesterol, earwax)
4. Nucleic acids: (DNA and RNA)
Characteristics of Living Organisms
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Made up of cells (tiny organized structures)
Reproduce on their own (bacteria, plants)
Metabolism (break down foods)
Cellular organization
All living things (organisms) have a Life Cycle
Scientific Method
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(an organized way of thinking about things, solving
problems and answering questions)
Steps of the Scientific Method:
Observations
Questions
Hypothesis (educated guess)
Predications
Controlled testing
Conclusions
Controlled Testing (experiments)
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Groups to be compared
 Scientist has good idea of expected results
1. Control Group – no changes are made
2. Experimental Group – one change is made
 Condition changed is the variable (temp, food,
fertilizer given to experimental group)
 Hypothesis of test is a possible explanation for the
expected results of the experiment. A hypothesis
that is not supported is rejected.
Experiment
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Control Group no AZT
Experimental Group
AZT is given to patients
 Variable is AZT
 Results:
1. Living longer is a result
of taking AZT therefore:
Living Longer is
Dependent on AZT
(Independent variable)
Safe Laboratory Procedures
 Glassware: very hard glass so when it breaks is
shatters, wear glasses when using glassware, jagged
edges are very sharp on cracked glassware
 Flames: not loose clothing, hair should be up, glasses,
careful handling, not horse play around flames, use
utmost caution
 Chemicals: wear glasses, not eating drinking or
touching eyes. Treat all chemicals as poisons, clean up
spills, wash hands after using, report all problems
immediately
Design an Experiment
 What is the question?
 How will you design an experiment using control and
experimental group?
 What is the expected results?
 Record the results in table as numbers
 Make a Graph
 Analyze the graph
 Make a conclusion