Which is wrong about nucleic acids?
A.DNA is single stranded in some viruses
B.One turn of Z DNA has 12 bases
C.RNA is double stranded occasionally
D.Length of one helix is $45\mathop {\text{A}}\limits^{\text{o}} $ in B DNA

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Hint:To solve this question, you must recall the properties of nucleic acids, namely DNA and RNA. DNA stands for deoxyribonucleic acid and is double stranded and RNA stands for ribonucleic acid and is a single strand. RNA and DNA are similar chemically except the nature of sugar.

Complete answer:
DNA and RNA are nucleic acids and polymers of corresponding sugars and nucleotides. Both the nucleic acids are chemically similar except for the difference in the nature of sugar present in the chain. DNA has an extra deoxy sugar in the nucleotide. DNA and RNA also differ in their sizes. RNA molecules are smaller in size than DNA molecules and unlike DNA, RNA are found in the cytoplasm of the cell, outside the nucleus.
RNA is a single stranded molecule. DNA molecules are designed in such a way so as to store genetic information. Thus it requires to be stable and is present in a double helix structure to prevent oxidation. However it can be single stranded in some viruses but RNA is not a double stranded molecule. They are never meant to have a longer life. They always exist as single stranded molecules and are much more reactive and short lived than DNA molecules.

Thus, the correct answer is C.

Both RNA and DNA are synthesized in the nucleus of a cell, but RNA is not present in the nucleus. After it is synthesized in the nucleus, RNA is transferred to the cytoplasm and is then transferred throughout the body.