Cell Membrane

prison cell Membrane

In 1665, Robert Hooke, an English scientist observed cork under a microscope and mention that it was dispassionate of small units. He called these units cells. Later it was observed that close to living things argon composed of cells. This led to cell theory. Cell theory is that living things be composed of cells.

A theory is a hypothesis that scientific investigations leave shown to be true near of the time. A law is a hypothesis that scientific investigations have shown to be true all of the time. Cell theory is non cell law. This is because life forms called viruses, viriods and priods atomic number 18 not composed of cells. separate than these limited exceptions, all life is composed of cells. The cell is the rudimentary unit of life.

Many organisms such as bacteria, amoeba, some algae, and yeast are composed of moreover a single cell. The single celled organisms are described as being unicellular. However, most organisms are composed of many cells and are described as being multicellular. totally cells live in a fluid environment. The human body, for example, is to the highest degree 70% water. To live, cells must be able to obtain temporal from and release substances into a liquid environment. It is the cell membrane which allows materials to happen into a cell, as well as allowing substances to be released from a cell.



An important property of the cell membrane is that it is semipermeable. Semipermeable agent that the membrane only allows certain things to pass into or taboo of the cell. Generally, only those materials that need to enter the cell are allowed to enter. Generally, only those materials which need to be released from the cell are allowed to leave the cell.

Cell membranes are composed of two layers of molecules called phospholipid. This phospholipid...

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