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This illustration was published in his work Micrographia.ĭespite Hooke’s early description of cells, their significance as the fundamental unit of life was not yet recognized. Robert Hooke (1635–1703) was the first to describe cells based upon his microscopic observations of cork. At the time, Hooke was not aware that the cork cells were long dead and, therefore, lacked the internal structures found within living cells. To Hooke, thin sections of cork resembled “Honey-comb,” or “small Boxes or Bladders of Air.” He noted that each “Cavern, Bubble, or Cell” was distinct from the others ( Figure 3.5). The English scientist Robert Hooke first used the term “cells” in 1665 to describe the small chambers within cork that he observed under a microscope of his own design. However, modern cell theory grew out of the collective work of many scientists. Today, these tenets are fundamental to our understanding of life on earth. Cells are the fundamental units of organisms.All cells only come from other cells (the principle of biogenesis).While some scientists were arguing over the theory of spontaneous generation, other scientists were making discoveries leading to a better understanding of what we now call the cell theory. Explain the contributions of Semmelweis, Snow, Pasteur, Lister, and Koch to the development of germ theory.Explain the key points of endosymbiotic theory and cite the evidence that supports this concept.Explain the key points of cell theory and the individual contributions of Hooke, Schleiden, Schwann, Remak, and Virchow.3.2 Foundations of Modern Cell Theory Learning Objectives