The electron microscope was invented by ..........

  • A
    $Knoll$ and $Ruska$
  • B
    $Rudolph$ and $Kolliker$
  • C
    $C.P. Swanson$
  • D
    None of these

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According to the modern theory,the cell exhibits .......

The thin layer surrounding the animal cells observed by $Schwann$ is known today by what name?

Explain the cell theory.

What could the cell theory proposed by Schleiden and Schwann not explain?

Which of the following is the correct sequence of biological organization in organisms?

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