(9)
5. Angive de omtrentlige dimensioner af DNA.
Stryer, s. 122, fig 5.11
Stryer, s. 750, tab. 27.1
Devlin, s.47, tab.2.3

• the bases are nearly perpendicular to the helix axis - 1˚ tilted, and adjacent bases are separated by 3,4 Å.
   

• there are 10,4 bases per turn of helix - the helical structure repeats every 34Å (3,4nm)
   

• the diameter of the helix is ca 23,7 Å (2.4 nm)
   

• the length of the DNA molecule depends on the species. In a bacteriofag, there are 5000 base pairs per DNA molecule. In one human DNA molecule there are over 10⁸ base pairs.
   

• major groove - 12Å wide, 8.5Å deep
   

• minor groove - 6Å wide, 7.5Å deep

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