Which is wrong about nucleic acids?

DNA is single stranded in some viruses

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One turn of Z DNA has 12 bases

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RNA is double-stranded occasionally

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Length of one helix is

45 o A

in B-DNA

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Solution

The correct option is A Length of one helix is $45 o A$ in B-DNA
The diameter of the B-DNA is nearly 20 Angstroms, and the distance between base pairs is around 3.4 Angstroms. 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. This translates into about 20-21 nucleotide per turn. The double helix structure of DNA contains a major groove and minor groove.

Hence, the correct option is $D$

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Similar questions

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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