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Cell : The Unit of Life

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What is plasma membrane?

Plasma membrane is the outer membrane of the cell. It is composed of lipids bilayer which is quasi fluid in nature. The plasma membrane is semi permable in nature. Besides, the lipid content it also has protein and carbohydrates. It provides protection and structural support to the cell. The plasma membrane helps in the transport of material in and out of the cell. The fluid nature of the membrane helps in the formation of cell wall, secretion, cell growth etc. 


Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann 

 What are receptor molecules ?

Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response. 

State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not. 

What is the function of contractile vacuole in amoeba?