What are the two forms of DNA?

There are two types of DNA in the cell – autosomal DNA and mitochondrial DNA. Autosomal DNA (also called nuclear DNA) is packaged into 22 paired chromosomes. In each pair of autosomes, one was inherited from the mother and one was inherited from the father.

Do humans have AB or Z-DNA?

Z-DNA, also known as left-handed DNA, is different from the more familiar right-handed B-DNA. Until recently, the role of Z-DNA in humans was a mystery. Most of the DNA in our cells takes the form of B-DNA. The familiar B-DNA is also known as right-handed DNA because the DNA strands wind to the right.

What is B model of DNA?

In B-DNA, the most common double helical structure found in nature, the double helix is right-handed with about 10–10.5 base pairs per turn. The double helix structure of DNA contains a major groove and minor groove. In B-DNA the major groove is wider than the minor groove.

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

The key difference between B DNA and Z DNA is that the B DNA is the commonest form of DNA, which is a right-handed helix while the Z DNA is the long and thin version of B DNA, which is a left-handed helix. Among these three, B DNA is more predominate in cells, and it is the form described by Watson and Crick.

How Z-DNA differs from A or B-DNA?

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

Which of the following is the characteristic feature of Z-DNA?

Z-DNA is thus characterized by a dinucleotide repeat in which anti and syn conformations of the bases alternate in succession along the chain. The deoxyribose–phosphate backbone follows a zigzag left-handed course rather than the smoothly spiraling right-handed path found in B-DNA.

Which of the following is true about Z-DNA helix?

Explanation: Thymine is present in DNA. 9. Which of the following is true about Z-DNA helix? It has more base pairs per turn than B-DNA.

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

B-DNA is narrower than A-DNA. Z-form DNA is a left-handed double helix. It has a very different structure when compared with A-DNA and B-DNA. The zigzag appearance of backbone allows it to be distinguished from other forms of DNA.

How many base pairs are there in Z-DNA?

One turn of Z-DNA has 12 base pairs and the length is 4.56nm. The distance between two adjacent deoxyribonucleotides is 0.37nm. Same as the other forms of DNA, hydrogen bond is present to hold the two strands together. Z-DNA is difficult to be observed since it is unstable.

What is the helix width of B-DNA?

The helix width of B-DNA is 2nm. B-DNA is narrower than A-DNA. Z-form DNA is a left-handed double helix. It has a very different structure when compared with A-DNA and B-DNA. The zigzag appearance of backbone allows it to be distinguished from other forms of DNA.

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

In addition to B- and Z-DNA, DNA can exist in another form known as A-DNA. A-DNA occurs when DNA is dehydrated, but also in DNA/RNA hybrids and double stranded RNA. A-DNA with the elements colored. A-DNA with the bases colored.