DNA Types
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Overview
DNA has three main structural forms: A-DNA, B-DNA, and Z-DNA. B-DNA, the most common, is the typical double-helix structure. A-DNA and Z-DNA have distinct shapes, with A-DNA appearing shorter and wider, and Z-DNA having a left-handed helix. These structural variations play roles in DNA functions within cells.A-DNA
A type DNA is a right-handed, double helical structure of the DNA molecule. It has a wider and shorter helix than the more common B type DNA. A type DNA is found in specific biological contexts, such as in certain RNA-DNA hybrid structures and in chromatin remodeling.
B-DNA
B type DNA is the most common double helical structure of the DNA molecule. It has a narrow and longer helix than the A type DNA. B type DNA is the most stable form and is the basis for most of the DNA structures found in living organisms.
Z-DNA
Z type DNA is a left-handed double helical structure of the DNA molecule. It is more elongated and thinner than the A and B forms. Z DNA is found in certain DNA sequences and is involved in gene regulation and expression.