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2016-03-08T00:27:41+05:30

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It synthesises proteins needed 4 the chemical needs of the cells.
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2016-03-08T00:47:27+05:30

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Ribosomes are non-membrane-bounded particles where protein synthesis occurs. The number of ribosomes in a cell varies depending on its functions. For example, pancreatic cells and those of other glands have many ribosomes because they produce secretions that contain proteins. 

Though, simply, they are: 
- tiny dot-like structures 
- composed of RNA and protein 
- they have two types; attached (to the rough ER) and free 
- they function for protein synthesis
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