8-27 - Definition of a cell 1. A cell is the simplest form...

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Unformatted text preview: Definition of a cell 1. A cell is the simplest form of life that is capable of living and reproducing in a non-living environment. 2. All cells are surrounded by a plasma membrane. Chapter 1 Introduction to the Study of Cell and Molecular Biology Cell biology began as a result of the discovery that curved glass surfaces can bend light & form images 1. Spectacles were first made in Europe in the 13 th century 2. First compound (double-lens) microscopes were made by the end of the 16 th century 3. By the mid-1600s, a handful of scientists had used handmade microscopes to uncover a previously unseen world Robert Hooke (1665), English microscopist Question: why cork stoppers could hold air in a bottle so effectively Result: Chambers in cork (part of the bark of trees); called them cells (cellulae) since they reminded him of cells occupied by monks living in a monastery Fact: Empty cell walls of dead plant tissue; no internal structure walls originally made by the living cells they surrounded Anton van Leeuwenhoek (1665-1675), Dutch seller of clothes & buttons in spare time, he ground lenses & made microscopes of remarkable quality A. The first to describe living single cells; his results were checked and confirmed by Hooke B. Saw animalcules in pond water (first to do this) using the scopes that he made C. First to describe various forms of bacteria from tooth scrapings & water in which pepper was soaked Three tenets of Cell Theory Matthias Schleiden, German lawyer turned botanist (1838) despite differences in tissue structures, all plant tissues were made of cells & that plant embryos arise from single cell Theodor Schwann, German zoologist (1839) realized cellular basis of animal life; concluded that plants & animals are similar structures. concluded that plants & animals are similar structures....
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This note was uploaded on 09/18/2008 for the course PCB 3134 taught by Professor Multiple during the Spring '08 term at University of Florida.

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8-27 - Definition of a cell 1. A cell is the simplest form...

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