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Chapter 1 - 2. Energy conversion a. Energy flows through an...

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Biology Chapter 1 Biology : the scientific study of life : the science that focuses on life Biological organization : microscopic scale to large scale 1. Biosphere: all environments on earth that are inhabited by life (land, water, air) 2. Ecosystems: all living things in a particular area and non-living components (grasslands, deserts) 3. Communities: all organisms inhabiting a particular ecosystem (trees, plants, animals, fungi) 4. Population: all the individuals of a species living within a specified area (black bears) 5. Organisms: Individual living things (one tree frog) 6. Organs and Organ Systems: Digestive system-tongue, stomach, intestines 7. Tissues: Skin 8. Cells: Life’s fundamental unit of structure and function (muscle cell, neuroglial cell) 9. Organelles: various functional components of cells (lysosomes) 10. Molecules: chemical structure consisting of two or more small chemical units called atoms Ecosystems 1. Ecosystem dynamics a. Cycling of nutrients b. Flow of energy from sun to producer to consumer
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Unformatted text preview: 2. Energy conversion a. Energy flows through an ecosystem usually entering as light and exiting as heat b. Contrast with chemical nutrients which recycle within an ecosystem. Cells: The cell is the lowest level of organization that can perform all activities required for life. 1. The cells heritable information a. DNA is the substance of genes b. DNA replicates as a cell prepares to divide so that offspring inherit a complete set of genes. Biology Chapter 1 c. DNA directs the development and maintenance of the entire organism d. It is arranged in a double helix and made up of nucleotides. e. Most genes code for protein synthesis. f. Enzymes catalyze chemical reactions in a cell. g. Proteins build and maintain the cell h. The entire set of genetic instructions is known as the genome. i. Differing nucleotide sequences can produces more than 75000 kinds of proteins, each with a specific function. 2. Two main forms of cells a. Eukaryotic j. I....
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This note was uploaded on 04/17/2008 for the course BIO 130 taught by Professor Various during the Fall '07 term at Rhodes.

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Chapter 1 - 2. Energy conversion a. Energy flows through an...

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