(Éasy question..pls attention..).
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➳☞☞☞☞In eukaryotic cells..
▶ Ribosomes are attached with rough Endoplasmic Reticulum only.
▶ Or also in freely form in cytoplasm??
Answers
Answer:
Rough ER is named for its rough appearance, which is due to the ribosomes attached to its outer (cytoplasmic) surface. ... Proteins targeted for transport to the Golgi apparatus are transferred from ribosomes on rough ER into the rough ER lumen, which serves as the site of protein folding, modification, and assembly.
Ribosomes are found ‘free’ in the cytoplasm or bound to the endoplasmic reticulum (ER) to form rough ER. In a mammalian cell there can be as many as 10 million ribosomes. Several ribosomes can be attached to the same mRNA strand, this structure is called a polysome. Ribosomes have only a temporary existence. When they have synthesised a polypeptide the two sub-units separate and are either re-used or broken up.
Ribosomes can join up amino acids at a rate of 200 per minute. Small proteins can therefore be made fairly quickly but two to three hours are needed for larger proteins such as the massive 30,000 amino acid muscle protein titin.
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