Question

Length of one turn of the helix in a -form DNA is
approximately
(a) 3.4 nm (b) 2 nm
(c) 0.34 nm (d) 20 nm

Answer 1

Answer:

option(a) is the correct answer

Answer 2

Watson And Crick Model

Explanation:

    (c) The Length of one turn of the helix in a -form DNA is 0.34 nm.

1. As per Watson and Crick model of DNA, the DNA atom is comprised of two helical DNA chains that are twisted around a similar pivot.
2. The hydrophilic spines of exchanging sugar and phosphate bunches are available outwardly of the twofold helix confronting the encompassing water.
3. The nitrogenous bases, purine and pyrimidine are stacked inside the twofold helix.
4. Every nucleotide base of one strand is combined in a similar plane with a base of the other strand.
5. One complete turn of the twofold helix is 3.4 nm long and every one of which has 10 base combines, the separation between two back to back base sets ought to be 3.4/10 = 0.34 nm.