Table 4.3: RNA molecules in E. coli

Type

Relative amount (%)

Sedimentation coefficient (S)

Mass (kDa)

Number of nucleotides

Ribosomal RNA (rRNA)

80

23

1.2 × 103

3700

 

 

16

0.55 × 103

1700

 

 

  5

3.6 × 101

  120

Transfer RNA (tRNA)

15

  4

2.5 × 101

    75

Messenger RNA (mRNA)

  5

 

Heterogeneous