Review_Chapters_1-4_powerpoint

Review_Chapters_1-4_powerpoint - Chapter 1 Invitation to...

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3/13/11 Chapter 1 Invitation to Biology Biology – Scientific study of life Lays the foundation for asking questions about life and the natural world Why Study? Organisms construction How they function Where they live What they do Develop, modify and refine ideas about life
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3/13/11 Life’s Level of Organization Atom Molecule Cell Tissue Organ Organ System Multicellular organism Population ato m molec ule tiss ue c el l o r g a n organ system multice lled organis m popul ation co mm uni ecosyst em the biosphe
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3/13/11 Overview of Life’s Unity Common Threads DNA only in living cells – signature molecule of life Molecule of Inheritance Directs assembly of proteins DNA and Inheritance Acquisition of traits by transmission of DNA from parent to offspring Reproduction – mechanism by which parents
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3/13/11 Overview of Life’s Unity Common Threads Metabolism – required for life – cell acquires and uses energy to grow, reproduction and maintenance Producers – Consumers - Decomposers Producers - plants and other organisms that make food from simple precursors Consumers – Eat other organisms, both producers and other consumers Decomposers – are consumers, mostly bacteria and
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3/13/11 Overview of Life’s Unity Common Threads Energy Flow Energy input, from sun Nutrient Cycling Producers plants, and other self-feeding organisms Consumers animals, most fungi, many protists, many bacteria Energy output (mainly metabolic heat)
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3/13/11 Overview of Life’s Unity Common Threads Sensing and Responding Organisms sense changes in their environment and make responses to the changes How – Receptors: detect specific forms of energy (stimuli) Why - Maintenance of homeostasis – wants to keep changes in the internal environment to a minimum
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3/13/11 Life’s Diversity Common Threads in past 3.9 billion years Millions of Living species 99.9% are extinct Species is defined as an organism with unique traits Carolus Linnaeus – Scientific Names or Nomenclature Two-part name Humphead parrotfish is Scarus gibbus
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3/13/11 Life’s Diversity Classification System – Three Domains Grouped based on descent from a shared ancestor Bacteria Archaea Eukarya
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3/13/11 Life’s Diversity Prokaryotic Organisms: Single Cells No Nucleus Smaller, less complex Archaea and Eubacteria Eukaryotic Organisms Single or multcellular Nucleus
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3/13/11 Evolution’s View of Diversity How did we become so diverse? Mutations: Source of variation in heritable traits Change in DNA code or structure May be harmful, neutral or beneficial Evolution Heritable change in a line of descent over time Populations change, not individuals
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3/13/11 Evolution’s View of Diversity How did we become so diverse?
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Review_Chapters_1-4_powerpoint - Chapter 1 Invitation to...

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