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Cell : The Unit of Life

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
Describe the arrangement of  phospholipid layer of cell membrane ?

Lipids are arranged in bilayer. The  polar head of the lipid head towards the outer sides forming a hydrophillic layer. The non-polar heads face towards the inner side forming the hydrophobic layer. The arrangement ensures that the nonpolar tail is protected from the aqueous enviroment. Lipid components mainly consist of phosphoglycerides.

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State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not.
1562 Views

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.
941 Views

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

Theodore Schwann
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What is the function of contractile vacuole in amoeba?

Excretion.
1170 Views

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

Mathias Schleiden.
1517 Views