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A unique molecule, known as __________, combines with several proteins to form the eukaryotic signal recognition...

A unique molecule, known as __________, combines with several proteins to form the eukaryotic signal recognition particle.

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Answer #1

Answer: ribonucleoprotein (a nucleoprotein with 7S RNA, 11S)

Reason:

Cotranslational translocation is mediated by signal recognition particle (SRP) & it is a 11S ribonucleoprotien essential for translocation of nascent polypeptide to the “ER lumen”. This SRP is formed of a nucleoprotein with 7S RNA, 11S & combines with several proteins to form the eukaryotic signal recognition particle. Therefore, when this SRP sequence exits from the ribosome, the nascent polypeptide stops being translocated into the ER lumen. Signal recognition particle has bound by a signal sequence and flowed by slow protein synthesis in the translation. This SRP further is going to bind to the location near by endoplasmic reticulum followed by release of signal recognition particle but the growing polypeptide is in the form of protein-ribosome complex that is at the exact location for further protein translocation through Golgi-vesicle translocation channel.

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