Lecture3 - Summary 33 1 Cells follow rules of chemistry 2...

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Summary 33 1. Cells follow rules of chemistry; 2. Water is the most abundant substance proteins constitutes most of a cell’s dry mass; 1. Four major classes of small organic molecules make macromolecules; 1. Living cells undergo metabolism; 2. A reaction will happen if it can result in lower free energy in the system; 1. Proteins and protein complexes execute almost all cell functions. TA review sections start this week Class limit increased—can be more than 300
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Lecture 3 Visualizing Cells: Microscopy
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4. Birth of Cell Biology: 1838 German botanist and cytologist, Schleiden and Schwann, proposed the “cell doctrine”: all plant and animal tissues are aggregates of individual cells and the cell is the basic structural unit of all organism. Schwann saw boundaries in animal cartilage cells and concluded that animals are also made of cells like in plants. 5. 1855 German physiologist, Virchow, concluded that all cells arise only from preexisting cells—via cell division. So the cell is also the basic unit of reproduction. 1. 1655 Hooke, Curator of the Royal Society of London, saw small pores n sections of cork: “cell”--empty cell walls of dead plant tissue, not live cells. He noticed that cells from other plant tissues have material (he called “juice). only 30X
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Lecture3 - Summary 33 1 Cells follow rules of chemistry 2...

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