Question

In: Biology

Which of the following statements is correct?



Which of the following statements is correct? 

An individual ribosome can bind to only one mRNA because it is degraded after translation 

The large and small subunits of an individual ribosome are joined when the ribosome is not translating an mRNA. 

The ribosomal subunit that first binds the mRNA is the small subunit 

A and B are both correct. 

A and C are both correct.

Solutions

Expert Solution

Answer:ā€Eā€ Both A and C are correct.

Explantion: Ribosomes are special cell organalles required for protein synthesis.They are made up of rRNA and proteins.they are synthesized in the nucleolus and then transported to the cytoplasm. When the process of translation begins, the smaller subunit of the ribosome first binds the mRNA and then the larger subunit comes and joins the smaller subunit on the mRNA molecule. The smaller subunit is meant to decode and the larger subunit adds up the amino acids. A particular ribosome can bind only one mRNA molecule and it moves on the mRNA as the amino acids are being added. After the process of translation is completed, the subunits will be seperated and the ribosome will be degraded.

Sometimes many ribosomes can bind a mRNA molecule so that many polypeptides will be formed at a time, such a structure with many ribosomes on a mRNA molecule is known as polysome or polyribosome.


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