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.
Theodore Roosevelt, the 26th President, was the youngest at age 42 and 322 days old. When President McKinley was shot at the Pan American Exhibition in Buffalo, NY in 1901, ex-Vice President Theodore Roosevelt, succeeded the assassinated William McKinley and became the youngest person ever to become President the age of 42 on September 14, 1901.