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Cell : The Unit of Life

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Class 10 Class 12
What is sodium-potassium exchange pump?

Na+/K+ is a active tranport pump which involves the inflow of Na+ and outflow of K+ or vice versa through membrane of cell. It is an energy dependent process which utilizes ATP for the production of energy.

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.

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

Theodore Schwann

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

Mathias Schleiden.

What is the function of contractile vacuole in amoeba?

Excretion.

State one difference between gram positive and gram negative bacteria.

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

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