Chapter_1_-_Part_I-1

Chapter_1_-_Part_I-1 - Chapter 1 What is Biology? Bio =...

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Chapter 1
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What is Biology? Bio = “life” ology =“study of”
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Humans have an interest in all forms of life: We grow plants We keep pets We raise livestock We observe wildlife Etc.
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How is Life Studied? Life can be split into levels Each level serves as a building block for the next one Atom molecule cell tissue organ organ system multicellular organism species population community ecosystem biosphere See figure 1.1 in your textbook
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Atom Smallest particle of an element Element = pure chemical substance consisting of only one type of atom Retains the properties of that element Combine to form molecules Hydrogen Oxygen Carbon
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Molecule Assemblies of atoms Ex: 2 Hydrogen atoms + 1 Oxygen atom ? Living things are composed of organic molecules contain a framework of carbon with some hydrogen provide building blocks for cells Discusses in more detail with Chapter 2 1 H 2 O 2 + = Hydrogen Oxygen Water
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Cell Smallest Unit of Life Living organisms can be: single celled (unicellular) Ex: Amoebas, paramecium Multicellular Ex: plants, birds, mammals Combine to form tissues
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Tissue Only found in multicellular organisms! Composed of similar cells that perform a similar function Ex: muscle cells combine to form muscle tissues Tissues may combine to form organs
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Organ Structure made up of several tissues that function as a unit Ex: heart, lungs, bran Organ system 2 or more organs working together to execute a specific bodily function Ex: heart makes up part of circulatory system; lungs make up part of respiratory system Multicellular organisms consist of several organ systems
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Species similar, potentially interbreeding organisms
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Chapter_1_-_Part_I-1 - Chapter 1 What is Biology? Bio =...

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