Question

DNA helices exist in various form. Which of the following form is predominantly expressed in cells​

Answer 1

Explanation:

Three major forms of DNA are double stranded and connected by interactions between complementary base pairs. These are terms A-form, B-form,and Z-form DNA.

B-form DNA

The information from the base composition of DNA, the knowledge of dinucleotide structure, and the insight that the X‑ray crystallography suggested a helical periodicity were combined by Watson and Crick in 1953 in their proposed model for a double helical structure for DNA. They proposed two strands of DNA -- each in a right‑hand helix -- wound around the same axis. The two strands are held together by H‑bonding between the bases

Answer 2

There are three different DNA types:

• A-DNA: It is a right-handed double helix identical to the B-DNA form.
• B-DNA: This is the most widespread DNA configuration and is a right-handed helix.
• Z-DNA: Z-DNA is a left-handed DNA where the double helix winds to the left in a zig-zag structure.

B DNA is the term DNA provided for the canonical right-handed DNA helix that is the most familiar form of DNA.

• The most familiar structure, existing in most DNA at neutral pH and physiological salt concentrations, is B-form. That is the definitional, right-handed double helical configuration we have been discussing.