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(D) During the process of translation in protein synthesis,the ribosome exists as two subunits: a smaller subunit and a larger subunit.These two subun

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$Mg^{++}$

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(D) During the process of translation in protein synthesis,the ribosome exists as two subunits: a smaller subunit and a larger subunit.These two subunits remain separate in the cytoplasm when not involved in protein synthesis.When the smaller subunit binds to the mRNA,the larger subunit attaches to it to form the functional ribosome complex.This association of the two ribosomal subunits is dependent on the concentration of magnesium ions $(Mg^{++})$.Therefore,$Mg^{++}$ ions are essential for the assembly of the functional ribosome.

During translation in protein synthesis,the joining of the larger and smaller subunits of the ribosome requires . . . . . . ions.

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