Question

Which ion holds the ribosomal subunits together?
(A) $C{a^{2 + }}$
(B) $M{n^{2 - }}$
(C) $M{g^{2 + }}$
(D) $N{a^ - }$

Answer 1

Hint: Ribosomes are the important cell organelle that is found floating in the cytoplasm of the cell or it is attached to the endoplasmic reticulum. It consists of the RNA and the other proteins that are needed for the cell metabolism. The main function of the ribosomes is to synthesis proteins that help to repair, damage or direct the chemical process of the cell.

Complete answer:
The ribosomes have the components of two subunits as the larger and the smaller units. Each ribosomal unit consists of the RNA nucleotide molecules and also their associated proteins. When these two subunits are joined together, it constitutes the active ribosomes of synthesis of the protein. This joining of the two subunits is mainly done by the magnesium ions present in the cell.

When there is a higher amount of the magnesium ions in the cell, the unit’s groups together and produces the larger amount of the proteins for the cellular processes. But when there are least magnesium ions in the cell, then all the small and the larger subunits go separate from each other and thus result in the lea production of the proteins.

Hence the correct answer is OPTION(B)

Note: In the eukaryotic cells, the cell consists of the $80$ ribosomes located in the cytosol of the cell. In each ribosome, there are $60$ large units and the $40$ small units in them. In these ribosomal subunits, there are RAN nucleotides and the associate proteins. Ribosomes with all these components are called transitional apparatus.