DNA which is composed of dinucleotide unit is

A DNA

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B DNA

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C DNA

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Z DNA

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Solution

The correct option is D Z DNA
The Z DNA helix is left-handed and has a structure that repeats every 2 base pairs. The major and minor grooves. Z DNA is composed of dinucleotide unit. Z DNA is one of the many possible double helical structures of DNA. It is a left-handed double helical structure in which the double helix winds to the left in a zig-zag pattern.

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DNA is composed of repeating units of

DNA nucleotide is composed of ..............

A single strand of DNA is composed of repeating______

List-I	List-II
a. DNA Ligase	$1$ . Catalyses the covalent union of segments of an interrupted sugarphosphate strand in double-stranded DNA
b. DNA polymerase	$2$ . End nuclease that digests either single stranded or double stranded DNA
c. DNase I	$3$ . Produces single or double stranded breaks in DNA during replication to release tension brought about by the separation of double strands
d. DNA topoisomerase	$4$ . Catalyses the formation of DNA worn deoxyribonucleotides using one strand of DNA as template

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