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  9. Q22

JKPSC KAS 2021 · Question 22 of 96

Which one of the following is not true about the structure of DNA?

Science & Technology

  1. ADNA is a double stranded helix with sugar-phosphate as backbone.
  2. BDNA is always a right handed helix.Correct
  3. CDNA strands run in opposite direction.
  4. DDNA has both major and minor grooves.

Answer: B. DNA is always a right handed helix.

Explanation

DNA is usually right-handed (B-DNA) but can also exist in left-handed (Z-DNA) form; it is not always right-handed.

Source: JKPSC KAS Prelims 2021 GS via gkscientist.com

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