Bio - Lecture 4 - An Overview of a Cell A Cell is the basic...

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Sheet1 Page 1 An Overview of a Cell: A Cell is the basic unit of life Composed of organelles within a plasma membrane Ranges in szie form the smallest bacteria to the largest ostrich egg Calls can perform all the activities of life: -It can move -It uses energy -It responds to stimuli -It can grow First observed in 1665 by Robert Hooke -Coined the term "cell" because it reminded him of a monks' room (called a cellula, "A small room") Saw cells in "cork" which is a tissue in plants (30x magnification) Although there are different tiypes of cells, every cell contains a few things in common: -Genetic material (with a few exceptions) -Cytoplasm -Plasma membrane The genetic material of a cell is its DNA which is located in a centralized place -Nucleoid in prokaryotes -Nucleus in eukaryotes The main difference between a nucleoid and a nucleus is the latter is segregated from the other cellular organelles by a nucle The cytoplasm is the interior of a cell It is a semi-fluid matrix containing the cellular organelles
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