![]() These findings led to the formation of the modern cell theory, which has three main additions: first, that DNA is passed between cells during cell division second, that the cells of all organisms within a similar species are mostly the same, both structurally and chemically and finally, that energy flow occurs within cells. Since the formation of classical cell theory, technology has improved, allowing for more detailed observations that have led to new discoveries about cells. In 1839 German physiologist Theodor Schwann and German botanist Matthias Schleiden promulgated that cells are the elementary particles of organisms in both plants and animals and recognized that some organisms are unicellular and others multicellular. How are plant and animal cells different Close your eyes and picture a brick wall. Cell theory states that the cell is the fundamental structural and functional unit of living matter. The third part, which asserts that cells come from preexisting cells that have multiplied, was described by Rudolf Virchow in 1858, when he stated omnis cellula e cellula (all cells come from cells). Cells are the basic building blocks of all animals and plants. These parts were based on a conclusion made by Schwann and Matthias Schleiden in 1838, after comparing their observations of plant and animal cells. The second part states that cells are the basic units of life. The first part states that all organisms are made of cells. The classical cell theory was proposed by Theodor Schwann in 1839. This discovery led to the development of the classical cell theory. ![]() A year later, his colleague, anatomist Theodor Schwann, concluded that all animals are also composed of cells. In 1838, German botanist Matthias Schleiden proposed that all plants are composed of cells. While looking at cork, Hooke observed box-shaped structures, which he called “cells” as they reminded him of the cells, or rooms, in monasteries. Later in that century, Anton Van Leeuwenhoek, a Dutch merchant, made further observations of plant, animal, and microorganism cells. The invention of the microscope led to the discovery of the cell by Hooke. In 1665, Robert Hooke published Micrographia, a book filled with drawings and descriptions of the organisms he viewed under the recently invented microscope.
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