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Cell : The Unit of Life

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Class 10 Class 12
What is the disadvantage of freely permeable membrane?

If the membrane is freely permeable, then any material outside would enter into the cell and cell cannot remain as a separate unit from environment. Because of this the cell will not be able to perform the life processes efficiently.

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.

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 is the function of contractile vacuole in amoeba?

Excretion.

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