The fundamental unit of life Flashcards
Biology ch;1
What is a cell
The body of a living organism is made up of very tiny units called cells.
Who discovered cell? and when?
Robert Hooke discovered cell in 1665
Cell means ………..
A little room
Who discovered free living cells in pond water for first time and when?
Leeuwenhoek in 1674
when was the nucleus discovered and by who?
Robert Brown in 1831 discovered nucleus of the cell
Who coined the term ‘protoplasm’ and when
Purkinje coined the term ‘protoplasm’ in 1839
Cell theory was given by __________ and __________ in ____ and ____
Schleiden in 1838 and Shawn in 1839
Cell Theory was expanded by _________ in _______
Virchow in 1855
Describe the cell theory
All plants and animals are made up of cells
cell is the basic unit of life
All cells arise from pre - existing cells
Discovery of Electron microscpe
1940
Why is cell called the structural functional unit of life?
Because each cell has its own existence
What is a plasma membrane?
It is the outermost covering of cell that separates the contents of cell from its external environment
Why is plasma membrane called a selectively permeable membrane
Because it allows only the movement of certain substances in and out of the cell
What is endocytosis
The ingestion of material by the cell through a selectively permeable membrane
Cell wall is mainly composed of _________
Cellulose
