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Chapter Chosen

Cell : The Unit of Life

Book Chosen

Biology

Subject Chosen

Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Which of the following is not correct?
  •  Robert Brown discovered the cell.
  • Schleiden and Schwann formulated the cell theory.
  • Virchow explained that cells are formed from pre-existing cells.
  • A unicellular organism carries out its life activities within a single cell.


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

Mathias Schleiden.

 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 

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?

Excretion.