BIO 1140 Chapter Notes - Chapter 2: Transfer Dna, Nucleoid, Absolute Dating
12 Aug 2016
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Chapter 2. 1 basic features of cell structure and function. Carry out the essential processes of life. Use chemical molecules or light as energy sources for their activities. Respond to changes in their external environment by altering their internal reactions. Duplicate and pass on their hereditary information as part of cellular reproduction. Prokaryote: organism in which the dna is suspended in the cell interior without separation from other cellular components by a discrete membrane. Cells representing all three domains archaea, bacteria, eukarya assume a wide variety of forms. Size and shape vary, yet all cells are organised the same. All have structures that perform similar activities. Microscopy: technique for producing visible images of objects that are too small to be seen by the human eye. Light microscope: microscope that uses light to illuminate the specimen. Electron microscope: microscope that uses electrons to illuminate the specimen. Magnification: the ratio of an object as viewed to its real size.
