Question

Which of the following is not a part of cell theory
* cell has thin outer layer called plasma membrane
* all living organisms are made up of cells and products of cells
* all cells arise from pre existing cells
* all of the above

Answer 1

Answer:

Cell has thin outer layer called plasma membrane .

According to Virchow's modern cell theory, states that

1)all organisms are made up of cell,

2) cell is structural and functional unit of life, and

3) all cell arise from pre-existing cell .

Answer 2

Answer:

All of the above are part of cell theory but the statement

The cell has a thin outer layer called the plasma membrane is not a part of modern cell theory.

Explanation:

• In 1838 German Botanist Matthias Schleiden gave the postulate that all plants are composed of cells. In 1839 zoologist Theodor Schwann proposed the hypothesis that animals and plants are composed of cells and are products of cells.
• He also observed a thin outer layer called plasma membrane present in cells.
• Schleiden and Schwann postulated the cell theory together.
• In 1855 Rudolf Virchow said that cells arise from pre-existing cells.
• He modified the cell theory and the modern cell theory consists of two postulates:

1. All organisms are composed of cells and are products of cell
2. All organisms are composed of cells and are products of cellCells arise from pre-existing cells.

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