Transcript Unifying Themes in Biology Represent recurring patterns

Unifying Themes In Biology
Recurring patterns/ideas that are found
throughout the study of living systems
1. Cell Structure & Function
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Same basic structure in unicellular or multicellular organisms
Slight differences are found when a cell differentiates (specializes) to
perform a specific function
2. Stability & Homeostasis
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Maintaining internal conditions
Temp., hormone levels, heart rate, blood sugar, sodium content, water
levels, etc.
Even unicellular organisms must do this
3. Reproduction & Inheritance
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Genetic instructions(DNA) must be passed on to all cells
Asexual reproduction takes place in unicellular organisms, makes exact
copies
Sexual reproduction takes place in multicellular organisms, adds genetic
variability
Unifying Themes In Biology
4. Evolution
 Populations change over (many) generations
 Natural selection means that the type of environment a population
is in determines which traits are advantageous
5. Interdependence of Organisms
 All organisms in an ecosystem depend on one another for survival
6. Matter, Energy & Organization
 Living things are highly organized
 Different structures have evolved to carry out different
functions
 An enormous amount of energy is needed to maintain structure
 Energy is continuously recycled between the organisms & their
environment
Characteristics of Life
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Cells
Organization
Energy use
Homeostasis
Growth
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Cell division (mitosis)
Cell growth
Differentiation
Development- growth & change through a life cycle
Reproduction
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Essential for continuation of species