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Ribosomes are responsible for protein synthesis

The nucleus is surrounded by the nuclear membrane
ribosome - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis.
rough endoplasmic reticulum - (rough ER) a vast system of interconnected, membranous, infolded and convoluted sacks that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane).

Actually, ribosomes are the responsible for protein synthesis, but they are not organelles

The Golgi body packages proteins and carbohydrates into membrane-bound vesicles for "export" from the cell.
lysosome - (also called cell vesicles) spherical organelles surrounded by a membrane; they contain digestive enzymes.

Protein Synthesis Organelles - Cells R Us - Google Sites

WHAT ORGANELLE IS THE SIGHT OF PROTEIN SYNTHESIS…

Proteins that require special conditions or are destined to become part of the cell membrane are processed in the ER and then handed off to another organelle called the Golgi apparatus.

Similar to TnaC described above, the peptide SecM exists solely to stallthe ribosome synthesizing it. But unlike TnaC, which also requires thepresence of high levels of trytophan, SecM has an intrinsic stallingcapability. Stalling of the ribosome synthesizing SecM provides time fora downstream RNA helix on the same mRNA strand to unwind. Unwinding ofthis helix then allows for a new ribosome to bind and synthesize anew protein, SecA, a bacterial ATP-driven translocase that aids the passage ofnascent proteins across membranes in conjunction with SecY (see also ). When sufficient levels of SecA have been reached,SecA interacts with the SecM-stalled ribosome to pull on SecM, freeingit and allowing translation to resume (illustrated schematically inFig. 13). SecM, which serves no otherpurpose than to stall the ribosome, is released into the cell anddegraded.

Protein and RNA complex responsible for protein synthesis ..

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