the DNA double helix is coiled in a right-handed fashion, and the pitch of the helix (one full loop) is 3.4 nm . Each turn or loop contains roughly 10 base pairs, making the distance between consecutive base pairs approximately 0.34 nm . Mastering these molecular dimensions is a high-priority strategy, as NCERT textbooks serve as the definitive primary source for approximately 95% of NEET Biology questions .