Endoplasmic reticulum protein synthesis? | Yahoo …
Some parts of the endoplasmic reticulum appear smooth when viewed by EM and are hence named (SER). Smooth endoplasmic reticulum is involved in the production of phospholipids and steroids and also in the detoxification of substances such as drugs or ingested chemicals. Ingestion of large amounts of a toxic substance, such as a pesticide, results in an increase in the amount of SER in cells. Normally, however, most of the endoplasmic reticulum appears granular, being dotted with many ribosomes (Figure 17). This part of the endoplasmic reticulum is given the name , and is the site where lysosomal proteins (mainly digestive enzymes), membrane proteins, and proteins that are destined for export from the cell are synthesised and processed.
This tutorial introduces endoplasmic reticulum
Endoplasmic Reticulum (ER) Membrane system of folded sacs and channels Site for protein and lipid synthesis Rough ER- where ribosomes attach Smooth ER- where lipids are synthesized
A ribonucleoprotein is a structure consisting of protein and RNA (ribonucleic acid).
In prokaryotes, the cytoplasm surrounding the nucleoid is rich in risosomes (and is called the riboplasm) - in bacteria proteins that
make up the ribosome are the most abundant proteins in the cytosol.
In eukaryotes ribosomes can exist free in the cytosol or bound to endoplasmic reticulum (forming rough endoplasmic reticulum, or
RER, so-called because the ribosomes stud its outer/cytosolic surface).