the grand unifying themes of biology there are eight overriding themes that will recur throughout...
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The Grand Unifying Themes of Biology
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There are eight overriding themes that will recur throughout this course.
Throughout our journey think about how each topic and concept visited
ties in to one or more of these themes.
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Are you ready?
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Theme #1: Science as a Process
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Science is a way of knowing. It can involve a discovery process using inductive reasoning, or it can be a process of
hypothesis testing.
Example: development of the cell theory, or the discovery of the structure of DNA.
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Theme #2 : Evolution
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Understanding biological change of organisms that occurs over time, which is driven by the process of natural selection.
Evolution accounts for the diversity and unity of life on Earth.
Example: Widespread use of antibiotics has selected for antibiotic resistance in disease-
causing bacteria.
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Theme # 3: Energy Transfer
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Energy is the capacity to do work. All living organisms are active (living)
because of their abilities to link energy reactions to biochemical reactions that
take place within their cells.
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Example: the energy of sunlight, along with
carbon dioxide and water, allows plant
cells to make organic materials, synthesize
chemical energy molecules, and
ultimately release oxygen into the environment.
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Theme #4: Continuity and change
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All species tend to maintain
themselves from generation to
generation using the same genetic code. However, there are genetic mechanisms that
lead to change over time.
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Example: mitosis consistently replicates cells in an organism; meiosis (and hence sexual reproduction) results in genetic variability.
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The structural levels from molecules to organisms ensure
successful functioning in all living organisms and living systems.
Theme #5: Relationship of structure and function
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The aerodynamics of a bird’s wing permits flight.
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Theme #6: Regulation
Everything from cells to organisms to ecosystems is in a state of dynamic balance
that must be controlled by positive or negative feedback mechanisms.
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Copyright © 2002 Pearson Education, Inc., publishing as Benjamin CummingsFig. 54.21
Example: control of soil nutrients by forest community.
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Example: control of body temperature by the brain.
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Theme #7: Interdependence in nature
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Living organisms rarely exist alone in nature.
Example: microscopic organisms can live in a symbiotic relationship in the intestinal tract of another organism; the host provides shelter and nutrients, and the microorganisms digest food.
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Theme #8: Science, Technology, and Society
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Scientific research often leads to technological advances that can have a
positive and/or negative impact on society as a whole.
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Examples:
• biotechnology and the development of the Hepatitis B vaccine;
• monitoring environmental consequences of global warming,
• genetic engineering and
• efforts to conserve the dwindling biodiversity on Earth.
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THE END