The RNA that acts as the main structural component of ribosomes is called ribosomal RNA or rRNA. They are extremely permanent and insoluble. 80-90% of cells are rRNA. That is, it is the main part of the ribosome. Its molecular weight is 5-20 lakh daltons. Each rRNA molecule is made up of about 3,000 nucleotides. It is unbranched and unbranched. However, if the ionic level increases, a two-factor condition may occur in some places. Adenine and uracil and guanine and cytosine pair at the double-stranded position. rRNA combines with proteins to form ribonucleoprotein particles. There are three types of rRNA in progenitor cells (23S, 16S, 5S) and four types (28S, 18S, 5.8S, 5S) in protocells.
Function: rRNA forms ribosomes and helps in protein synthesis.