february 10 - February 10, 2009 The Human Body Cell...

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February 10, 2009 The Human Body Cell Structure and Function Cell Theory The cell is the smallest unit of life. All living organisms are composed of cells. All cells come from pre-existing cells. Characteristics of All Cells Cells are very small. Cells must obtain energy and nutrients. Cells contain DNA. Cells contain cytoplasm. liquid component (because cytoplasm is an aqueous solution) dissolved in this water, we find organelles (mitochondria, Golgi apparatus, etc.) Cells contain ribosomes. (A ribosome is not an organelle). particles composed of proteins and RNA site of protein synthesis Cells are bound by a plasma membrane. Which of the following classes of biomolecules are part of the plasma membrane? a. lipids b. proteins c. carbohydrates d. lipids and proteins e. lipids, proteins, and carbohydrates Plasma Membrane: Functions cell structure cell-cell recognition cell-cell communication cell-cell adhesion = long-term attachments between cells
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february 10 - February 10, 2009 The Human Body Cell...

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