BIOL120 Study Guide - Midterm Guide: Scanning Electron Microscope, Matthias Jakob Schleiden, Symbiogenesis
5 Aug 2016
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Challenges that plants have to face: harvesting light energy, getting out of the water, locking in moisture when water is not available, coping with gravity, dividing, using resources. Cells were first observed and discovered by robert hooke, cellula in latin means small room . Cells must stay small so that the surface area, which allows for exchange of oxygen, water and nutrients, can supply the needs of the internal regions for a given volume. If cells grow too big, its genetic material cannot supply information fast enough to meet the needs of the cell. (page 27) Transmission electron microscope (tem) reveals structures of a cell by passing through a thin layer of tissue this type of microscope achieves the highest resolution. Scanning electron microscope reveals the surface of a cell. German botanist matthias schleiden concluded that microscopic studies confirmed that plants are composed of cells. A year later, theodor schwann confirmed that animals are also composed of cells.
