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The 5 organelles which are typically considered to not be found within animal cells include the following:
1. Cell Wall - This is a cell structure outside of the plasma membrane which is composed of a rigid layer of polysaccharides found within the cells of fungi, plants, and bacteria. It consists of mostly cellulose within the cells of algae and higher plants.
2. Central Vacuole - This is usually the largest organelle in plants. It is a large fluid filled space containing cellular materials and wastes which is surrounded by a membrane. This structure provides support for the plant by maintaining the proper pressure within plant cells.
3. Chloroplast - These are plastids (organelles unique to plants). They are found in plant and eukaryotic algae. They function to produce food via photosynthesis.
4. Chromoplast -These plastids are heterogeneous structures responsible for pigment synthesis as well as serve a storage function within selected photosynthetic eukaryotes.
5. Leucoplast - This plastid structure is considered to be a chloroplast which loses its chlorophyll due to light deprivation.
One word of caution with this type of question. Nature has a way of changing our way of thinking as we become more aware. The author of this post is not a fan of using the term "never" to describe biological phenomena. Often, the term "never" has been replaced with plausible or possible when science sheds light on the truth.
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