A) bacteria
B) fungus
C) algae
D) virus
Correct Answer: D
Solution :
The cell theory is one of the basic principles of biology. Credit for the formulation of this theory is given to German scientists Theodor Schwann, Mathias Schleiden and Rudolph Virchow. The cell theory states: (i) All living organisms are composed of cells. They may be unicellular or multicellular. (ii) The cell is the basic unit of life. (iii) Cells arise from pre-existing cells. The modem version of the cell theory includes the ideas: Energy flow occurs within the cells. Hereditary information (DNA) is passed on from cell to cell. All cells have the same basic chemical composition.
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