Cell Membrane Function. The cell membrane (plasma membrane) is a thin semi-permeable membrane that surrounds the cytoplasm of a cell. Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell, while keeping other substances out.
25 years old, 2 December 1886 to Theodore Roosevelt, rancher and author, (27 October 1858, New York, New York, died 6 January 1919, Oyster Bay, New York) at St. Georgeâs Anglican Church, Hanover Square, London, England.
On September 6, 1901 an assassin's bullet tore into President William McKinley and eventually propelled Vice President Theodore Roosevelt to the presidency. McKinley was cut down while attending the Pan American Exposition in Buffalo, New York. TR was vacationing in New York's Adirondack Mountains when the news reached him.