INTRODUCTION
CELL STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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All cells are produced from existing cells
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All cells have organelles and nuclei
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Cells are the basic unit of structure and function
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Plants and animals are made up of cells
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Detailed explanation-1: -Cell theory does not state that all cells have a nucleus. In fact, not all cells do have a nucleus. A nucleus is a feature of eukaryotic cells only. All prokaryotes, members of domain Archaea and domain Bacteria, lack a nucleus and membrane bound organelles.
Detailed explanation-2: -The correct option is C All cells are surrounded by cell wall.
Detailed explanation-3: -Cell wall is only found in plant cells and not in any other cells.
Detailed explanation-4: -Cell theory has 3 basic points: All living things are made of one or more cells. The cell is the smallest living thing that can perform all the functions of life. All cells must come from pre-existing cells through cellular division.
Detailed explanation-5: -Only the cells of advanced organisms, known as eukaryotes, have a nucleus. Generally there is only one nucleus per cell, but there are exceptions, such as the cells of slime molds and the Siphonales group of algae. Simpler one-celled organisms (prokaryotes), like the bacteria and cyanobacteria, don’t have a nucleus.