INTRODUCTION
CELL STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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New cells are produced by division of existing cells
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All organisms are composed of more than one cell
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Cells must contain a nucleus
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Not all cells are alive
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Detailed explanation-1: -Complete answer: In 1858, Rudolph Virchow observed the process of cell division and claimed that cells only arose from the division of pre-existing cells. He stated in his cell theory that all living organisms are made up of single or multiple cells.
Detailed explanation-2: -The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
Detailed explanation-3: -Cells produce new cells by cell division. Cell division is required for growth, repair, regeneration and reproduction. Eukaryotic cells divide by mitosis and meiosis cell division. Prokaryotic cells divide by binary fission.
Detailed explanation-4: -The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells.
Detailed explanation-5: -All cells only come from other cells (the principle of biogenesis). Cells are the fundamental units of organisms.