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16 January, 20:01

Which of following is not a tenet of the cell theory?

A. The cell is the structural unit of life.

B. Cells can only arise by division from a pre-existing cell.

C. All organisms are composed of one or more cells.

D. All cells must have a nucleus.

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  1. 16 January, 20:20
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    D. All cells must have a nucleus

    Explanation:

    According to the tenets of the cell theory:

    a. the cell is the structural unit of life, in other words without the cell there is no life;

    b. Reproduction cannot occurs without cell division, hence cells can only arise by division from a preexisting cell;

    c. All organisms are composed of one or more cells, prokaryotes are referred to as singled celled organisms while eukaryotes are referred to as multi-cellular organisms;

    d. Not all cells must have a nucleus. There are two major types of cells; the prokaryotic cells and the eukaryotic cells. Eukaryotic cells have a well defined nucleus and other membrane bound organelles, while prokaryotic cells do not have a defined nucleus and other membrane bound organelles. Notwithstanding, they both contain genetic materials.
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