Question

Length of one turn of DNA is

• A. 3.4 $\mathring{A}$
• B. 34 $\mathring{A}$
• C. 20 $\mathring{A}$
• D. 3.04 $\mathring{A}$

Answer 1

The correct option is B 34 $\mathring{A}$

Distance between two pained nucleotides is 3.4 $\mathring{A}$ ($\mathring{A}$ = Angstrom). Each turn of double helices contains ten pained nucleotides. DNA helix makes one fall turn every 34 $\mathring{A}$