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The two subunits of ribosome remain united at a critical ion level of :
A
magnesium
B
calcium
C
copper
D
manganese
Detailed Solution
A ribosome is made of two unequal subunits: 50S and 30S in the 70S ribosome of prokaryotes, and 60S and 40S in the 80S ribosome of eukaryotes.
The association and dissociation of these two subunits depends on the concentration of magnesium ions ($Mg^{2+}$).
At a critical (higher) $Mg^{2+}$ concentration the two subunits remain united to form the complete ribosome.
When the $Mg^{2+}$ concentration falls below this level, the ribosome dissociates into its two subunits.
$Mg^{2+}$ ions neutralise the negative charges on the phosphate groups of rRNA and so help to hold the subunits together.
So the ion required is magnesium.
The association and dissociation of these two subunits depends on the concentration of magnesium ions ($Mg^{2+}$).
At a critical (higher) $Mg^{2+}$ concentration the two subunits remain united to form the complete ribosome.
When the $Mg^{2+}$ concentration falls below this level, the ribosome dissociates into its two subunits.
$Mg^{2+}$ ions neutralise the negative charges on the phosphate groups of rRNA and so help to hold the subunits together.
So the ion required is magnesium.