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Chapter 1Biology and You
Characteristics of Living OrganismsBiology is the study of life.
All living organisms share certain general properties that separate them from nonliving things.
Properties of LifeCellular organizationReproductionMetabolismHomeostasisHeredityResponsivenessGrowth and development
Branches of Biological ScienceTypes of Biological Science Clip
BotanyZoologyEcology
Themes of BiologyAs you study biology you will repeatedly encounter the
following seven themes.
1. Cellular Structure and Function2. Reproduction3. Metabolism4. Homeostasis5. Heredity6. Evolution7. Interdependence
Cellular Structure and function All organisms are made of cellsCells are the smallest unit of lifeOrganisms can have one cell or more than
one cell
Reproduction
All living things can reproduceMaintains the populations size Needed for survival of the species
Metabolism
Metabolism - Sum of all chemical reactions
Includes ways to obtain and use energy
Digestion
Homeostasis
Homeostasis – maintaining stable internal conditions regardless of external environment
Internal environment vs. external environment
Desert and tundra life
Heredity
Passing on traits / genes to the next generation
Parent offspring
Gene – basic unit of heredity
Evolution
Small changes to a population over large periods of time
Interdependence
Interactions between different species
Beneficial or harmful
Section 3: Scientific ProcessesObservation is the act of noting or perceiving
objects or events using the senses.
Scientific investigations begin with observations.
Observations cause scientists to ask questions about their observations.
Stages of Scientific InvestigationScientific investigations tend to have common
stages.
These stages are called the Scientific Method.
There is more than one way to conduct an investigation.
Scientific Methods or Scientific Processes are more accurate terms for the stages of scientific investigation.
Scientific MethodIncludes the following steps:
Collecting ObservationsAsking QuestionsForming a Hypotheses and making
Predictions Hypotheses – educated guess Prediction – expected outcome of a test
Confirming Predictions Experiment – planned procedure to test hypothesis
Drawing Conclusions
Pieces of an ExperimentControl Group – group that does not changeExperimental Group – group that changes in
1 wayIndependent Variable – factor that is changedDependent Variable – factor that is measured
Independent Variable
Dependent Variable
Scientific ExplanationsTheory – Set of
related hypothesis that have been tested many times by many scientists
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