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5.3.1.3. Ribosomal RNA

Ribosomal RNA

The ribosomal ribonucleic acid or ribosomal (rRNA) is the most abundant type of RNA (80-85% of total RNA) in cells and is, in part, the ribosomes. These are responsible for the synthesis of proteins according to the nucleotide sequence present in the messenger RNA.

The ribosomal RNA is 60% of the weight of the ribosomes.

The rRNA presents linear segments and double helix segments (secondary structure), due to the presence of complementary ribonucleotide sequences throughout the molecule.

The weight of rRNAs and ribosomes is usually expressed according to the Svedberg coefficient of sedimentation (s), which is directly proportional to the sedimentation rate of the particle during ultracentrifugation. The sedimentation coefficient is expressed in svedberg units (S), being a svedberg equivalent to 10-13 seconds.

The prokarytic cells have ribosomes 70 S, less weight than those of eukaryotic cells, 80 S.


         

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Biology and Geology teaching materials for Compulsory Secondary Education (ESO) and Baccalaureate students.