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Polysome is formed by:
A
a ribosome with several subunits
B
ribosomes attached to each other in a linear arrangement
C
several ribosomes attached to a single mRNA
D
many ribosomes attached to a strand of endoplasmic reticulum
Detailed Solution
During protein synthesis a single mRNA molecule can be translated by many ribosomes at the same time.
Several ribosomes attach one after another to a single mRNA strand and move along it, each one synthesising a copy of the same polypeptide.
This chain of ribosomes held together by one mRNA is called a polyribosome or polysome.
The polysome increases the efficiency of translation, because many copies of a polypeptide are produced from one mRNA in a short time.
The ribosomes of a polysome are not joined directly to each other, and attachment to the endoplasmic reticulum is not what defines a polysome.
So a polysome is formed by several ribosomes attached to a single mRNA.
Several ribosomes attach one after another to a single mRNA strand and move along it, each one synthesising a copy of the same polypeptide.
This chain of ribosomes held together by one mRNA is called a polyribosome or polysome.
The polysome increases the efficiency of translation, because many copies of a polypeptide are produced from one mRNA in a short time.
The ribosomes of a polysome are not joined directly to each other, and attachment to the endoplasmic reticulum is not what defines a polysome.
So a polysome is formed by several ribosomes attached to a single mRNA.