BIO_110___lecture_1_v2 - BIO 110 Summer 2007 Lecture 1 The...

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BIO 110, Summer 2007 Lecture 1
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The Unity and Diversity of Life The living organisms on our planet show tremendous diversity in form and function. Despite this diversity, all organisms share certain characteristics that distinguish them from non-living things. The similarity in these characteristics provides evidence that all organisms descended, or evolved, from a common ancestor.
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Living things are organized into levels of biological organization The cell is the most basic unit of life. Similar cells together form tissues . (mo^) Similar tissues together form organs . Organs work together in organ systems . Organ systems form complex organisms. Complex organisms together form higher levels of organization.
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Levels of biological organization
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Living things acquire materials and energy The chemical reactions that occur in cells are a part of metabolism ( su trao doi chat) . Some reactions extract nutrients, building materials and energy from food. Photosynthesis (su quang hop) involves chemical reactions that use solar energy to form chemical energy. For metabolism to continue in cells, all chemical reactions must be kept in a balance called homeostasis .
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Living things acquire materials and energy
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Living things respond, reproduce, and develop Organisms interact with, and respond to, their environment, often with movement. Every type of living organism can reproduce (produce another organism like itself).
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