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Question
Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?
Options
Ribosomal RNA
Transfer RNA
Messenger RNA
Primary mRNA transcript
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Solution
Ribosomal RNA
Explanation:
Ribosomal RNA (rRNA) is the specific class of RNA that physically combines with various proteins in the cytoplasm to construct the ribosome. These ribosomes are composed of two distinct parts: a large subunit and a small subunit, both of which contain their own set of rRNA molecules and stabilising proteins. While messenger RNA (mRNA) carries the genetic instructions and transfer RNA (tRNA) delivers the building blocks, it is the rRNA that provides the structural framework and the catalytic power needed to link amino acids together into a protein chain.
