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What is the Hans and Zacharias Janssen Cell Theory?

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The cell theory states that the cell is the basic unit of life. Hans and Zacharias Jansen greatly contributed to the various parts of this theory by inventing the first microscope.

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The cell theory also states that all living organisms are composed of cells. Organisms can be unicellular or multicellular. The theory states that all cells arise from pre-existing cells, according to About.com. Zacharias Jansen, a Dutch spectacle maker, invented the first compound microscope around 1590. Hans Jansen, Zacharias's father, was believed to have assisted in the creation of this young scientist's invention. The first microscope consisted of three draw tubes with lenses inside the ends. This microscope was complex for its time. The design consisted of a bi-convex eyepiece lens and a plano-convex objective lens. Magnifying images was achieved by sliding the draw tube in or out while focusing on the sample. When the tubes were extended to the maximum length, the microscope was able to magnify a sample up to 10 times the original size. The invention of this scientific instrument allowed Robert Hooke and Anton van Leeuwenhoek, notable scientists of the late 17th century, to observe diatoms, fossils and the first cells. The invention of the compound microscope laid the foundation for the advancement in microscopy.

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  • Q:

    Who were Hans and Zacharias Janssen?

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    Hans and Zacharias Janssen were a Dutch father and son accredited with the creation of the first microscope. Both lived in the Netherlands and were working with each other as spectacle makers.

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  • Q:

    What is cell biology?

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    Cell biology is the study of cell structure and function, based on the concept that the cell is the basic unit of life. Understanding cells permits a detailed understanding of the tissues and organisms that cells make up.

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  • Q:

    Cell biology concerns which aspects of a cell?

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    Cell biology is a discipline that views the cell as the fundamental unit of life and studies cell structure and function. It seeks to elucidate properties of cells that are universal to all or most cells as well as unique properties that are limited to a small subset of specialized cells.

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  • Q:

    What are the three parts of the cell theory?

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    The three fundamental propositions of classical cell theory are that the cell is the most basic unit of life, all life is made up of cells and cells are formed only by other cells. Each tenet of this theory is important to understanding the way living things function on every level.

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