Botany online: Genetic Information - Molecular Genetics - Ribosomal RNAs

Botany online 1996-2004. No further update, only historical document of botanical science!

Estimated Sizes of Plant Ribosomal RNA (T. A. DYER, 1982)
origin of the ribosomal RNA	sedimentation constant	size (molecular weight)	number of the nucleotides
Cytosolic Ribosomes
large subunit	25 S 5,8 S 5 S	1,3 x 10⁹* 5,07 x 10⁴ 3,84 x 10⁴	3580⁺ 157 120
small subunit	18 S	0,7 x 10⁶	1926⁺
Ribosomes of Chloroplasts
large subunit	23 S 5 S	1,4 x 10⁹ * 3,94 x 10⁴	2890⁺
small subunit	16 S	0,56 x 10^6*	1541⁺
Mitochondrial Ribosomes
large subunit	24 S 5 S	1,12 - 1,26 x 10^6*3,88 x10⁴	3082 - 3470⁺120
small subunit	18,5 S	0,69 - 0,78 x 10^6*	1800 - 2146⁺
estimation is based on the velocity in an electric field. High molecular RNA-fractions of Eschericia coli* with molecular weights of 1.1 and 0.56 x 10⁶ were chosen as reference values. + calculated from the molecular weights and referring to the 1541 nucleotides containing rRNA of Eschericia coli

Estimated Sizes of Plant Ribosomal RNA (T. A. DYER, 1982)