X-ray diffraction studies indicate the existence of a novel double-stranded DNA

Question

X-ray diffraction studies indicate the existence
of a novel double-stranded DNA with helical parameters that are somewhat different
from those observed for pure A- or B-type DNA. In this helix, ?Z, rise per pair, is 0.32
nm, and pitch p is 3.36 nm. Given this information, determine the number of base pairs
per turn and the mean rotation (twist) per base pair.
Given these parameters, how many base pairs are in a 41.5 nm long duplex of this DNA?
How long would an A-type or B-type helix be if it had the same number of base pairs?

Explanation / Answer

For dsDNA with

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