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Are a DNA strand can consist on z DNA and b DNA?

Updated: 8/19/2019
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Yes, a single DNA strand can have Z-DNA and B-DNA forms at different regions.

These forms can exists at different sections on the same strand but never simultaneously at the same region since they contradict each other. The vast majority of DNA is in the B form.

B-DNA is a right-handed double helix that twists 360 degrees every 10.0 base pairs.

Z-DNA is a left-handed double helix (this causes the phosphate backbone to zigzag) there are about 12.0 base pairs per 360 degree turn. This form contains extended repeats of G-C base pairs. Organisms do show evidence of having Z-DNA in living cells but its physiological role is currently unknown (although recently it has been hypothesized to play a part in gene control).

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Q: Are a DNA strand can consist on z DNA and b DNA?
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Difference between Z-DNA and B-DNA?

B DNA is the normal kind where it twists in what is called a right hand fashion. Z DNA is twisted in the opposite direction.


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What is the difference between Z-DNA and B-DNA?

Z-DNA is usually found in areas with alternating purine and pyrimidine bases (ie. -ATATAT- ). When you look at it from the side, Z-DNA zig-zags toward the top left of the page/screen (This is essentially what it means when you read "left-handed helical form"), compared to B-DNA ("right-handed") which spins toward the top right. If you look at the top looking down the center of the molecule, B-DNA has no hole in the center (like in A-DNA) and is arranged with the bases in the middle, then the sugar, and then finally the phosphate backbone is at the edges. Z-DNA also lacks a hole in the center, but due to the zig-zagging structure, there is no definite area to locate the bases, sugar, and phosphate backbone -- they are all jumbled up together.


When one dna molecule replicated the result is two dna molecules what is true of the second dna molecule?

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