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What is a non membrane bound organelle?

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2009-07-15 22:23:02
2009-07-15 22:23:02

According to Wikipedia:

The term organelle is the diminutive form of organ meaning 'little tool". Various texts, including the popular Campbell and Reece (6th edition) refer to ribosomes as organelles. Others do not. Some restrict the use to membrane-bound structures. This then leads to some confusion as to how to refer to ribosomes. Consequently many texts (Cormack, Introduction to Histology) delineate between membranous and non-membranous organelles. Non-membranous cell structures, which are sometimes not considered organelles, include: * ribosome * cytoskeleton * flagellum * centriole and microtubule-organizing center (MTOC). So basically the bulletpoints are non-membrane bound organelles.

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A membrane-bound organelle is an organelle surrounded by a plasma membrane.

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The cytoskeleton is the non membrane bound organelle that supports cell shape. There are three types of rods, in order of increasing size that make up the cytoskeleton; the microfilaments, intermediate filaments, and microtubules. Non of these are membrane bound.

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The only non-membrane-bound organelle is the ribosome, which is present in both eukaryotic and prokaryotic organisms.


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