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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 active transportation ?

Active transport is the transportation of molecules or ions against their concentration gradient that is from lower to the higher concentration. The process is energy dependent in which ATP is utilised. For example Na+/K+ Pump.

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

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.

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

Mathias Schleiden.

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