Which is wrong about nucleic acids?

Which is wrong about nucleic acids

Q. Which is wrong about nucleic acids?

  1. DNA is single stranded in some viruses
  2. RNA is double stranded occasionally
  3. Length of one helix is 45 Å in B-DNA
  4. One turn of Z-DNA has 12 bases

 Answer: Length of one helix is 45 Å in B-DNA

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