Viruses
Viruses are one of the exceptions to the rule of typical cell structure. They are not considered cells because they lack cellular structures, such as a nucleus, cytoplasm, and organelles. Instead, viruses consist of genetic material (DNA or RNA) enclosed in a protein coat.
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Cytoplasm is not considered a cell organelle because it is a jelly-like substance that fills the cell and surrounds the organelles, providing a medium for their activities. It does not have a membrane surrounding it like organelles do, and it is present in both prokaryotic and eukaryotic cells.
The endosymbiotic theory proposes that some organelles, such as mitochondria and chloroplasts, were once free-living prokaryotic cells that were engulfed by a host cell through endocytosis. Over time, these prokaryotic cells formed a symbiotic relationship with the host cell, eventually evolving into permanent organelles within the eukaryotic cell.
Viruses
No, cell walls are not considered organelles in a cell's structure. Organelles are membrane-bound structures within a cell that have specific functions, while cell walls are rigid structures found outside the cell membrane that provide support and protection to the cell.
organelles parts of a cell organ - considered of several tissues
No, cytoplasm is not considered an organelle within a cell. It is a jelly-like substance that fills the cell and surrounds the organelles. Organelles are specialized structures within the cell that perform specific functions.
Viruses are one of the exceptions to the rule of typical cell structure. They are not considered cells because they lack cellular structures, such as a nucleus, cytoplasm, and organelles. Instead, viruses consist of genetic material (DNA or RNA) enclosed in a protein coat.
The cell. An organism can be composed of one or many cells. Cells are composed of organelles, but organelles cannot function alone (with exceptions).
Presence of extra-chromosomal DNA: Mitochondria and chloroplasts
Yes, an animal cell has a nucleus which contains genetic material, and various organelles such as mitochondria, endoplasmic reticulum, Golgi apparatus, and lysosomes that perform specific functions within the cell.
No, organelles are not the basic functional unit of life according to cell theory. The cell is the basic structural and functional unit of all living organisms. Organelles are specialized structures within cells that carry out specific functions.
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The nucleus.nucleus
Cytoplasm is not considered a cell organelle because it is a jelly-like substance that fills the cell and surrounds the organelles, providing a medium for their activities. It does not have a membrane surrounding it like organelles do, and it is present in both prokaryotic and eukaryotic cells.