Definition of dissatisfaction noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
SUMMARY. 1  Endoplasmic reticulum is an organelle found in both eukaryotic animal and plant cells. 2  The rough ER, studded with millions of membrane bound ribosomes, is involved with the production, folding, quality control and despatch of some proteins.
The membranes of the ER are continuous with the outer nuclear membrane. Endoplasmic reticulum occurs in most types of eukaryotic cells, including Giardia, but is absent from red blood cells and spermatozoa. There are two types of endoplasmic reticulum: rough and smooth.